This document proposes a secure multi-owner data sharing scheme for dynamic groups in the cloud. It allows any user in a group to securely store and share data with others in the cloud. The key contributions are:
1) Any user can store and share data files with others through the cloud in a multi-owner manner.
2) The computation overhead and ciphertext size are constant and independent of the number of revoked users.
3) User revocation can be achieved without updating remaining users' private keys.
4) New users can directly decrypt files stored before their participation.
The proposed scheme uses group signatures for anonymous authentication and dynamic broadcast encryption for secure data sharing. It aims to address challenges like
Secure Data Sharing For Dynamic Groups in Multi-Attorney Manner Using Cloudpaperpublications3
Abstract: Cloud computing provides an economical and efficient solution for sharing data among the cloud users in the group , users sharing data in a multi-attorney manner preserving data and identity privacy from an untrusted cloud, it is still a challenging issue, due to frequent change of the membership in the group. In this paper, we propose a multi-attorney data sharing scheme for the dynamic groups in the cloud. By combing group signature and Tripple DES encryption techniques, any cloud user anonymously share the data with others. In addition, we analyze the security of our scheme with rigorous proofs, and demonstrate the efficiency of our scheme in experiments.Keywords: cloud computing, data sharing, privacy-preserving, access control, and dynamic groups.
Title: Secure Data Sharing For Dynamic Groups in Multi-Attorney Manner Using Cloud
Author: Vijaya Kumar Patil C, Manjunath H
International Journal of Recent Research in Mathematics Computer Science and Information Technology
ISSN 2350-1022
Paper Publications
This document proposes a secure multi-owner attribute authorities based data sharing scheme for dynamic groups in the cloud. It aims to enable secure data sharing in dynamic groups where there is no fixed attribute authority, using a key policy attribute-based encryption method to select dynamic attribute authorities. The proposed scheme uses group signatures, signed receipts, and dynamic broadcast encryption to allow cloud users to anonymously share data. It reduces computation cost and storage overhead compared to existing works, as the encryption computation cost and storage overhead are independent of the number of revoked users.
Iaetsd an efficient secure scheme for multi user in cloudIaetsd Iaetsd
This document proposes a secure multi-owner data sharing scheme for dynamic groups in the cloud. The scheme allows any user within a group to securely share data with others through a trusted cloud. It supports efficient dynamic groups where new users can directly access and modify files uploaded before their participation without contacting owners. User revocation is achieved through a public revocation list without changing remaining user keys. The scheme provides anonymity and security while ensuring storage and computation overhead remain constant regardless of revoked users. It aims to address challenges with existing systems through increasing redundancy of group managers and distributing workload across managers.
1) The document proposes a system model for secure data sharing in cloud environments using cryptography.
2) It aims to provide data confidentiality, access control of shared data, remove the burden of key management and file encryption/decryption for users, and support dynamic changes to user membership without requiring the data owner to always be online.
3) The proposed system addresses common challenges with secure data sharing in cloud computing like data security, access control, key management, and user revocation and rejoining.
Mona: Secure Multi-Owner Data Sharing for Dynamic Groups in the CloudShruthi Suresh
The document discusses secure multi-owner data sharing for dynamic groups in clouds. It outlines Mona, a scheme that uses dynamic broadcast encryption for access control and group signatures for authentication. Mona allows efficient revocation without updating other users' keys and supports anonymity and traceability. The document compares Mona to other schemes and finds Mona addresses issues around identity privacy and revocation more effectively. Future work aims to make Mona more reliable and scalable by handling failures of the group manager.
Mona secure multi owner data sharing for dynamic groups in the cloudAvinash K S
1) The document proposes a secure multi-owner data sharing scheme called Mona for dynamic groups in the cloud. Mona allows any user in a group to anonymously share data with others using techniques like group signatures and dynamic broadcast encryption.
2) Mona supports efficient membership changes without updating secret keys. New users can decrypt pre-existing files and revoking users does not require updating keys of remaining users.
3) Mona provides privacy-preserving access control where users can anonymously access cloud resources while allowing identity tracing by the group manager when needed. It aims to achieve secure and flexible data sharing for dynamic groups in the cloud.
SMONA: Secure Multi Owner Data Sharing for Dynamic Groups in the Cloudijsrd.com
The data is stored in the cloud. Storing data should be risky. Cloud provider should be trustful because the data is confidentential. The Group manager keeps the record of group members. The key distribution is done to the group of each department. The Group members can access the stored data from cloud. The encryption-decryption technique is used to store the data. Any cloud user can anonymously share data with others by providing group signature and dynamic broadcast encryption techniques. When new member joined in the group, new granted users can directly decrypt data files uploaded without contacting with data owners. Proposing a new model for Sharing Secure Data in the Cloud for the Multiuser Group.
Mona secure multi owner data sharing for dynamic groups in the cloudKrushna Panda
Any user in a dynamic group can anonymously share data on the cloud using Mona, a secure multi-owner data sharing scheme. Mona leverages group signatures and dynamic broadcast encryption so that the storage overhead and encryption costs are independent of the number of revoked users. It allows efficient user revocation without updating others' secret keys and new users can access previously shared data. Mona provides anonymity, access control, and traces misbehavior. It achieves efficient and secure data sharing for dynamic groups on an untrusted cloud.
Secure Data Sharing For Dynamic Groups in Multi-Attorney Manner Using Cloudpaperpublications3
Abstract: Cloud computing provides an economical and efficient solution for sharing data among the cloud users in the group , users sharing data in a multi-attorney manner preserving data and identity privacy from an untrusted cloud, it is still a challenging issue, due to frequent change of the membership in the group. In this paper, we propose a multi-attorney data sharing scheme for the dynamic groups in the cloud. By combing group signature and Tripple DES encryption techniques, any cloud user anonymously share the data with others. In addition, we analyze the security of our scheme with rigorous proofs, and demonstrate the efficiency of our scheme in experiments.Keywords: cloud computing, data sharing, privacy-preserving, access control, and dynamic groups.
Title: Secure Data Sharing For Dynamic Groups in Multi-Attorney Manner Using Cloud
Author: Vijaya Kumar Patil C, Manjunath H
International Journal of Recent Research in Mathematics Computer Science and Information Technology
ISSN 2350-1022
Paper Publications
This document proposes a secure multi-owner attribute authorities based data sharing scheme for dynamic groups in the cloud. It aims to enable secure data sharing in dynamic groups where there is no fixed attribute authority, using a key policy attribute-based encryption method to select dynamic attribute authorities. The proposed scheme uses group signatures, signed receipts, and dynamic broadcast encryption to allow cloud users to anonymously share data. It reduces computation cost and storage overhead compared to existing works, as the encryption computation cost and storage overhead are independent of the number of revoked users.
Iaetsd an efficient secure scheme for multi user in cloudIaetsd Iaetsd
This document proposes a secure multi-owner data sharing scheme for dynamic groups in the cloud. The scheme allows any user within a group to securely share data with others through a trusted cloud. It supports efficient dynamic groups where new users can directly access and modify files uploaded before their participation without contacting owners. User revocation is achieved through a public revocation list without changing remaining user keys. The scheme provides anonymity and security while ensuring storage and computation overhead remain constant regardless of revoked users. It aims to address challenges with existing systems through increasing redundancy of group managers and distributing workload across managers.
1) The document proposes a system model for secure data sharing in cloud environments using cryptography.
2) It aims to provide data confidentiality, access control of shared data, remove the burden of key management and file encryption/decryption for users, and support dynamic changes to user membership without requiring the data owner to always be online.
3) The proposed system addresses common challenges with secure data sharing in cloud computing like data security, access control, key management, and user revocation and rejoining.
Mona: Secure Multi-Owner Data Sharing for Dynamic Groups in the CloudShruthi Suresh
The document discusses secure multi-owner data sharing for dynamic groups in clouds. It outlines Mona, a scheme that uses dynamic broadcast encryption for access control and group signatures for authentication. Mona allows efficient revocation without updating other users' keys and supports anonymity and traceability. The document compares Mona to other schemes and finds Mona addresses issues around identity privacy and revocation more effectively. Future work aims to make Mona more reliable and scalable by handling failures of the group manager.
Mona secure multi owner data sharing for dynamic groups in the cloudAvinash K S
1) The document proposes a secure multi-owner data sharing scheme called Mona for dynamic groups in the cloud. Mona allows any user in a group to anonymously share data with others using techniques like group signatures and dynamic broadcast encryption.
2) Mona supports efficient membership changes without updating secret keys. New users can decrypt pre-existing files and revoking users does not require updating keys of remaining users.
3) Mona provides privacy-preserving access control where users can anonymously access cloud resources while allowing identity tracing by the group manager when needed. It aims to achieve secure and flexible data sharing for dynamic groups in the cloud.
SMONA: Secure Multi Owner Data Sharing for Dynamic Groups in the Cloudijsrd.com
The data is stored in the cloud. Storing data should be risky. Cloud provider should be trustful because the data is confidentential. The Group manager keeps the record of group members. The key distribution is done to the group of each department. The Group members can access the stored data from cloud. The encryption-decryption technique is used to store the data. Any cloud user can anonymously share data with others by providing group signature and dynamic broadcast encryption techniques. When new member joined in the group, new granted users can directly decrypt data files uploaded without contacting with data owners. Proposing a new model for Sharing Secure Data in the Cloud for the Multiuser Group.
Mona secure multi owner data sharing for dynamic groups in the cloudKrushna Panda
Any user in a dynamic group can anonymously share data on the cloud using Mona, a secure multi-owner data sharing scheme. Mona leverages group signatures and dynamic broadcast encryption so that the storage overhead and encryption costs are independent of the number of revoked users. It allows efficient user revocation without updating others' secret keys and new users can access previously shared data. Mona provides anonymity, access control, and traces misbehavior. It achieves efficient and secure data sharing for dynamic groups on an untrusted cloud.
Encryption based multi user manner secured data sharing and storing in cloudprjpublications
This summary provides the key details from the document in 3 sentences:
The document proposes a secure multi-owner data sharing scheme for dynamic groups in cloud computing. The scheme allows any user in a group to securely store and share data files with others through the untrusted cloud. It uses techniques like group signature and dynamic broadcast encryption to provide anonymous access control while enabling the group manager to trace real identities when needed, and allows efficient user revocation and participation of new users.
A secure anti collusion data sharing scheme for dynamic groups in the cloudKamal Spring
Benefited from cloud computing, users can achieve an effective and economical approach for data sharing among group members in the cloud with the characters of low maintenance and little management cost. Meanwhile, we must provide security guarantees for the sharing data files since they are outsourced. Unfortunately, because of the frequent change of the membership, sharing data while providing privacy-preserving is still a challenging issue, especially for an untrusted cloud due to the collusion attack. Moreover, for existing schemes, the security of key distribution is based on the secure communication channel, however, to have such channel is a strong assumption and is difficult for practice. In this paper, we propose a secure data sharing scheme for dynamic members. Firstly, we propose a secure way for key distribution without any secure communication channels, and the users can securely obtain their private keys from group manager. Secondly, our scheme can achieve fine-grained access control, any user in the group can use the source in the cloud and revoked users cannot access the cloud again after they are revoked. Thirdly, we can protect the scheme from collusion attack, which means that revoked users cannot get the original data file even if they conspire with the untrusted cloud. In our approach, by leveraging polynomial function, we can achieve a secure user revocation scheme. Finally, our scheme can achieve fine efficiency, which means previous users need not to update their private keys for the situation either a new user joins in the group or a user is revoked from the group.
A Secure Multi-Owner Data Sharing Scheme for Dynamic Group in Public Cloud. IJCERT JOURNAL
In cloud computing outsourcing group resource among cloud users is a major challenge, so cloud computing provides a low-cost and well-organized solution. Due to frequent change of membership, sharing data in a multi-owner manner to an untrusted cloud is still its challenging issue. In this paper we proposed a secure multi-owner data sharing scheme for dynamic group in public cloud. By providing AES encryption with convergent key while uploading the data, any cloud user can securely share data with others. Meanwhile, the storage overhead and encryption computation cost of the scheme are independent with the number of revoked users. In addition, I analyze the security of this scheme with rigorous proofs. One-Time Password is one of the easiest and most popular forms of authentication that can be used for securing access to accounts. One-Time Passwords are often referred to as secure and stronger forms of authentication in multi-owner manner. Extensive security and performance analysis shows that our proposed scheme is highly efficient and satisfies the security requirements for public cloud based secure group sharing.
A secure anti collusion data sharing scheme for dynamic groups in the cloud1crore projects
IEEE PROJECTS 2015
1 crore projects is a leading Guide for ieee Projects and real time projects Works Provider.
It has been provided Lot of Guidance for Thousands of Students & made them more beneficial in all Technology Training.
Dot Net
DOTNET Project Domain list 2015
1. IEEE based on datamining and knowledge engineering
2. IEEE based on mobile computing
3. IEEE based on networking
4. IEEE based on Image processing
5. IEEE based on Multimedia
6. IEEE based on Network security
7. IEEE based on parallel and distributed systems
Java Project Domain list 2015
1. IEEE based on datamining and knowledge engineering
2. IEEE based on mobile computing
3. IEEE based on networking
4. IEEE based on Image processing
5. IEEE based on Multimedia
6. IEEE based on Network security
7. IEEE based on parallel and distributed systems
ECE IEEE Projects 2015
1. Matlab project
2. Ns2 project
3. Embedded project
4. Robotics project
Eligibility
Final Year students of
1. BSc (C.S)
2. BCA/B.E(C.S)
3. B.Tech IT
4. BE (C.S)
5. MSc (C.S)
6. MSc (IT)
7. MCA
8. MS (IT)
9. ME(ALL)
10. BE(ECE)(EEE)(E&I)
TECHNOLOGY USED AND FOR TRAINING IN
1. DOT NET
2. C sharp
3. ASP
4. VB
5. SQL SERVER
6. JAVA
7. J2EE
8. STRINGS
9. ORACLE
10. VB dotNET
11. EMBEDDED
12. MAT LAB
13. LAB VIEW
14. Multi Sim
CONTACT US
1 CRORE PROJECTS
Door No: 214/215,2nd Floor,
No. 172, Raahat Plaza, (Shopping Mall) ,Arcot Road, Vadapalani, Chennai,
Tamin Nadu, INDIA - 600 026
Email id: 1croreprojects@gmail.com
website:1croreprojects.com
Phone : +91 97518 00789 / +91 72999 51536
Secure data sharing for dynamic groups in multi-owner using cloudSagar Dhanake
This document summarizes a seminar presentation on secure data sharing for dynamic groups in multi-owner cloud environments. The presentation covered cloud computing fundamentals and challenges with identity privacy. It proposed a system called MONA that allows any group member to securely store and share encrypted data files on an untrusted cloud. Key features of MONA include dynamic group management such that new users can access previous data, anonymous yet traceable access control, and efficient user revocation. The presentation discussed the system architecture, models, modules including registration, login and file sharing, relevant algorithms, applications, advantages, and future work concerning reliability.
A cloud storage system for sharing data securely with privacy preservation an...eSAT Journals
Abstract Cloud computing provides much-known services for storing user data over cloud server and it provides attention towards a broad set of technologies, rules and controls deployed to provide security for applications and data. As the more and more firm uses the cloud, security in cloud environment is becoming very important issue. It is much needed that companies should work with partners doing best practices of cloud security and which facilitate transparency for their solutions. Number of security solutions today depends on the authentication for security but it did not provide solution for the privacy problems while sharing data in the cloud environment. Data access request from the user itself may expose users’ private data no matter his request approved or not. So this becomes very important in sharing data in the cloud environment. In this paper we proposed a system which provides attention towards the above mentioned problem. In proposed system we used the concept of data anonymity for sending data access request to data owner and also provide the data auditing facility to detect fraud in the integrity of users shared data. Keywords: Cloud computing, privacy preservation, data integrity, data sharing, authentication
Preserving Privacy Policy- Preserving public auditing for data in the cloudinventionjournals
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
IRJET- Secure Data Sharing Scheme for Mobile Cloud Computing using SEDASCIRJET Journal
1) The document proposes a Secure Data Sharing in Clouds (SeDaSC) methodology for secure data sharing in cloud computing.
2) SeDaSC provides data confidentiality and integrity, access control, secure data sharing without reencryption, protection from insider threats, and forward/backward access control.
3) It encrypts files with a single key, and generates two shares of the key - one given to the user and the other stored by a trusted third party, to prevent insider threats from malicious users.
Securely Data Forwarding and Maintaining Reliability of Data in Cloud ComputingIJERA Editor
Cloud works as an online storage servers and provides long term storage services over the internet. It is like a third party in whom we can store a data so they need data confidentiality, robustness and functionality. Encryption and encoding methods are used to solve such problems. After that divide proxy re-encryption scheme and integrating it with a decentralized erasure code such that a secure distributed storage system is formulated. The distributed storage system not only supports secure, robust data storage and retrieval but also lets the user forward his data to another user without retrieving the data. A concept of backup in same server allows users to retrieve failure data successfully in the storage server and also forward to another user without retrieving the data back. This is an attempt to provide light-weight approach which protects data access in distributed storage servers. User can implement all important concept i.e. Confidentiality for security, Robustness for healthy data, Reliability for flexible data, Availability for compulsory data will be achieved to another user which is store in cloud and easily overcome problem of “Securely data forwarding and maintaining, reliability of data in cloud computing “using different type of Methodology and Technology.
Secure Data Sharing In an Untrusted CloudIJERA Editor
Cloud computing is a huge area which basically provides many services on the basis of pay as you go. One of the fundamental services provided by cloud is data storage. Cloud provides cost efficiency and an efficient solution for sharing resource among cloud users. A secure and efficient data sharing scheme for groups in cloud is not an easy task. On one hand customers are not ready to share their identity but on other hand want to enjoy the cost efficiency provided by the cloud. It needs to provide identity privacy, multiple owner and dynamic data sharing without getting effected by the number of cloud users revoked. In this paper, any member of a group can completely enjoy the data storing and sharing services by the cloud. A secure data sharing scheme for dynamic cloud users is proposed in this paper. For which it uses group signature and dynamic broadcast encryption techniques such that any user in a group can share the information in a secured manner. Additionally the permission option is proposed for the security reasons. This means the file access permissions are generated by the admin and given to the user using Role Based Access Control (RBA) algorithm. The file access permissions are read, write and delete. In this, owner can provide files with options and accepts the users using that option. The revocation of cloud user is a function generated by the Admin for security purpose. The encryption computational cost and storage overhead is not dependent on the number of users revoked. We analyze the security by proofs and produce the cloud efficiency report using cloudsim.
iaetsd Preserving private multi keyword searching with ranking by anonymous i...Iaetsd Iaetsd
This document discusses privacy-preserving multi-keyword ranked search over encrypted cloud data. It proposes assigning anonymous IDs to cloud users to hide their identities from the cloud service provider and better protect sensitive data on the cloud. The system allows data owners to encrypt and outsource data to the cloud for storage. It then builds a searchable index to allow authorized users to search for keywords without learning the content. The cloud server ranks search results based on relevance but hides information about important documents. Previous works focused on search and privacy but revealed user identities. The proposed system addresses this by anonymizing user IDs to maintain privacy under two threat models.
IRJET-Using Downtoken Secure Group Data Sharing on CloudIRJET Journal
The document proposes a secure group data sharing scheme on cloud using key aggregate search encryption (KASE). In the proposed scheme, a data owner can generate a single download token (DT) to share a group of encrypted files with multiple users. The users only need to upload the DT to the cloud to search and download the shared files. This reduces the complexity of managing multiple encryption keys compared to traditional schemes. The scheme provides security, dynamic changes, low computation and communication costs for file access and key updates.
A Privacy Preserving Attribute Based Access Control Mechanism In Distributed ...Editor IJCATR
We propose a new decentralized access control scheme for secure data storage in clouds that supports anonymous
authentication. In the proposed scheme, the cloud verifies the authenticity of the series without knowing the user’s identity before
storing data. Our scheme also has the added feature of access control in which only valid users are able to decrypt the stored
information. The scheme prevents replay attacks and supports creation, modification, and reading data stored in the cloud. We also
address user revocation. Moreover, our authentication and access control scheme is decentralized and robust, unlike other access
control schemes designed for clouds which are centralized. The communication, computation, and storage overheads are comparable
to centralized approaches.
A secure-anti-collusion-data-sharing-scheme-for-dynamic-groups-in-the-cloudPvrtechnologies Nellore
This document proposes a secure data sharing scheme for dynamic groups in the cloud. It allows group members to securely access and share data files stored in the cloud. The scheme provides secure key distribution without requiring secure communication channels. It also enables fine-grained access control and prevents collusion attacks between revoked users and the cloud. When users join or leave the group, other users do not need to update their private keys. The scheme aims to address limitations of existing approaches that require updating file-block keys for revocations and have overhead linearly increasing with member/revocation changes.
This document summarizes a proposed scheme for secure data sharing in dynamic groups in the cloud. It addresses key challenges including how to securely share data with fine-grained access control when group membership changes frequently. The proposed scheme uses key policy attribute-based encryption (KP-ABE) and group signatures to allow any cloud user to anonymously share data. It leverages techniques like dynamic broadcast encryption and signed receipts to reduce computation and storage overhead, making the costs independent of the number of revoked users. The scheme aims to enable secure multi-owner data sharing where attribute authorities are also dynamic.
Mona secure multi owner data sharing for dynamic groups in the cloudJPINFOTECH JAYAPRAKASH
The document proposes a secure multi-owner data sharing scheme called Mona for dynamic groups in the cloud. Mona allows any user in a group to anonymously share data with others in the cloud using group signatures and dynamic broadcast encryption. It aims to address challenges with existing schemes that have complexities increasing linearly with the number of owners and revoked users. The proposed Mona scheme achieves independent storage overhead and encryption costs from the number of revoked users and supports dynamic groups where new users can access previous files without owners.
IRJET- Security Enhancement for Sharing Data within Group Members in CloudIRJET Journal
1) The document proposes a secure data sharing scheme for sharing data within group members in the cloud. It aims to prevent collusion attacks and allow for secure sharing of data even as group membership changes dynamically.
2) The scheme uses encryption with private keys so that if a user's key is leaked, it will be difficult for others to access the shared data. A trusted authority authenticates users and stores encryption keys to determine responsibility if issues arise.
3) The scheme achieves secure key distribution without requiring secure communication channels by using public key verification. It also allows for fine-grained access control and secure revocation such that revoked users cannot access shared data even by colluding with the cloud.
This summarizes a research paper about an encryption-based secure data sharing and storage scheme for multi-user dynamic groups in the cloud. The proposed scheme leverages group signatures and dynamic broadcast encryption to allow any cloud user to anonymously share data while preserving identity privacy. It ensures storage overhead and encryption costs are independent of the number of users. The scheme provides security analysis and experiments demonstrating efficiency.
Review on Key Based Encryption Scheme for Secure Data Sharing on CloudIRJET Journal
This document reviews key-based encryption schemes for secure data sharing on cloud. It discusses how traditional encryption techniques are not suitable for large scale data sharing due to complex key management. A key-based encryption scheme is proposed that allows a data owner to generate an aggregate encryption key and submit a single aggregate trapdoor for keyword search. This reduces key management complexity and the number of trapdoors needed compared to traditional techniques. The proposed scheme uses seven polynomial algorithms for security including key generation, encryption, key extraction and trapdoor generation. It aims to provide an effective solution for secure and scalable data sharing using cloud storage.
Anonymous Key Based Secure File Encryption in CloudIRJET Journal
This document proposes a new system for secure file encryption and sharing in the cloud. It aims to address security issues with sharing data in social media. The key aspects of the proposed system are:
1. It creates separate databases for individual users and a local server to securely store user keys for encryption/decryption.
2. Files are encrypted using triple DES before being stored in the cloud to prevent unauthorized access.
3. A user can share files with others by providing encryption keys through the local server.
4. When a file is shared, a temporary server decrypts and re-encrypts the file with the recipient's key for added security.
The system aims to improve data security when
Encryption based multi user manner secured data sharing and storing in cloudprjpublications
This summary provides the key details from the document in 3 sentences:
The document proposes a secure multi-owner data sharing scheme for dynamic groups in cloud computing. The scheme allows any user in a group to securely store and share data files with others through the untrusted cloud. It uses techniques like group signature and dynamic broadcast encryption to provide anonymous access control while enabling the group manager to trace real identities when needed, and allows efficient user revocation and participation of new users.
A secure anti collusion data sharing scheme for dynamic groups in the cloudKamal Spring
Benefited from cloud computing, users can achieve an effective and economical approach for data sharing among group members in the cloud with the characters of low maintenance and little management cost. Meanwhile, we must provide security guarantees for the sharing data files since they are outsourced. Unfortunately, because of the frequent change of the membership, sharing data while providing privacy-preserving is still a challenging issue, especially for an untrusted cloud due to the collusion attack. Moreover, for existing schemes, the security of key distribution is based on the secure communication channel, however, to have such channel is a strong assumption and is difficult for practice. In this paper, we propose a secure data sharing scheme for dynamic members. Firstly, we propose a secure way for key distribution without any secure communication channels, and the users can securely obtain their private keys from group manager. Secondly, our scheme can achieve fine-grained access control, any user in the group can use the source in the cloud and revoked users cannot access the cloud again after they are revoked. Thirdly, we can protect the scheme from collusion attack, which means that revoked users cannot get the original data file even if they conspire with the untrusted cloud. In our approach, by leveraging polynomial function, we can achieve a secure user revocation scheme. Finally, our scheme can achieve fine efficiency, which means previous users need not to update their private keys for the situation either a new user joins in the group or a user is revoked from the group.
A Secure Multi-Owner Data Sharing Scheme for Dynamic Group in Public Cloud. IJCERT JOURNAL
In cloud computing outsourcing group resource among cloud users is a major challenge, so cloud computing provides a low-cost and well-organized solution. Due to frequent change of membership, sharing data in a multi-owner manner to an untrusted cloud is still its challenging issue. In this paper we proposed a secure multi-owner data sharing scheme for dynamic group in public cloud. By providing AES encryption with convergent key while uploading the data, any cloud user can securely share data with others. Meanwhile, the storage overhead and encryption computation cost of the scheme are independent with the number of revoked users. In addition, I analyze the security of this scheme with rigorous proofs. One-Time Password is one of the easiest and most popular forms of authentication that can be used for securing access to accounts. One-Time Passwords are often referred to as secure and stronger forms of authentication in multi-owner manner. Extensive security and performance analysis shows that our proposed scheme is highly efficient and satisfies the security requirements for public cloud based secure group sharing.
A secure anti collusion data sharing scheme for dynamic groups in the cloud1crore projects
IEEE PROJECTS 2015
1 crore projects is a leading Guide for ieee Projects and real time projects Works Provider.
It has been provided Lot of Guidance for Thousands of Students & made them more beneficial in all Technology Training.
Dot Net
DOTNET Project Domain list 2015
1. IEEE based on datamining and knowledge engineering
2. IEEE based on mobile computing
3. IEEE based on networking
4. IEEE based on Image processing
5. IEEE based on Multimedia
6. IEEE based on Network security
7. IEEE based on parallel and distributed systems
Java Project Domain list 2015
1. IEEE based on datamining and knowledge engineering
2. IEEE based on mobile computing
3. IEEE based on networking
4. IEEE based on Image processing
5. IEEE based on Multimedia
6. IEEE based on Network security
7. IEEE based on parallel and distributed systems
ECE IEEE Projects 2015
1. Matlab project
2. Ns2 project
3. Embedded project
4. Robotics project
Eligibility
Final Year students of
1. BSc (C.S)
2. BCA/B.E(C.S)
3. B.Tech IT
4. BE (C.S)
5. MSc (C.S)
6. MSc (IT)
7. MCA
8. MS (IT)
9. ME(ALL)
10. BE(ECE)(EEE)(E&I)
TECHNOLOGY USED AND FOR TRAINING IN
1. DOT NET
2. C sharp
3. ASP
4. VB
5. SQL SERVER
6. JAVA
7. J2EE
8. STRINGS
9. ORACLE
10. VB dotNET
11. EMBEDDED
12. MAT LAB
13. LAB VIEW
14. Multi Sim
CONTACT US
1 CRORE PROJECTS
Door No: 214/215,2nd Floor,
No. 172, Raahat Plaza, (Shopping Mall) ,Arcot Road, Vadapalani, Chennai,
Tamin Nadu, INDIA - 600 026
Email id: 1croreprojects@gmail.com
website:1croreprojects.com
Phone : +91 97518 00789 / +91 72999 51536
Secure data sharing for dynamic groups in multi-owner using cloudSagar Dhanake
This document summarizes a seminar presentation on secure data sharing for dynamic groups in multi-owner cloud environments. The presentation covered cloud computing fundamentals and challenges with identity privacy. It proposed a system called MONA that allows any group member to securely store and share encrypted data files on an untrusted cloud. Key features of MONA include dynamic group management such that new users can access previous data, anonymous yet traceable access control, and efficient user revocation. The presentation discussed the system architecture, models, modules including registration, login and file sharing, relevant algorithms, applications, advantages, and future work concerning reliability.
A cloud storage system for sharing data securely with privacy preservation an...eSAT Journals
Abstract Cloud computing provides much-known services for storing user data over cloud server and it provides attention towards a broad set of technologies, rules and controls deployed to provide security for applications and data. As the more and more firm uses the cloud, security in cloud environment is becoming very important issue. It is much needed that companies should work with partners doing best practices of cloud security and which facilitate transparency for their solutions. Number of security solutions today depends on the authentication for security but it did not provide solution for the privacy problems while sharing data in the cloud environment. Data access request from the user itself may expose users’ private data no matter his request approved or not. So this becomes very important in sharing data in the cloud environment. In this paper we proposed a system which provides attention towards the above mentioned problem. In proposed system we used the concept of data anonymity for sending data access request to data owner and also provide the data auditing facility to detect fraud in the integrity of users shared data. Keywords: Cloud computing, privacy preservation, data integrity, data sharing, authentication
Preserving Privacy Policy- Preserving public auditing for data in the cloudinventionjournals
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
IRJET- Secure Data Sharing Scheme for Mobile Cloud Computing using SEDASCIRJET Journal
1) The document proposes a Secure Data Sharing in Clouds (SeDaSC) methodology for secure data sharing in cloud computing.
2) SeDaSC provides data confidentiality and integrity, access control, secure data sharing without reencryption, protection from insider threats, and forward/backward access control.
3) It encrypts files with a single key, and generates two shares of the key - one given to the user and the other stored by a trusted third party, to prevent insider threats from malicious users.
Securely Data Forwarding and Maintaining Reliability of Data in Cloud ComputingIJERA Editor
Cloud works as an online storage servers and provides long term storage services over the internet. It is like a third party in whom we can store a data so they need data confidentiality, robustness and functionality. Encryption and encoding methods are used to solve such problems. After that divide proxy re-encryption scheme and integrating it with a decentralized erasure code such that a secure distributed storage system is formulated. The distributed storage system not only supports secure, robust data storage and retrieval but also lets the user forward his data to another user without retrieving the data. A concept of backup in same server allows users to retrieve failure data successfully in the storage server and also forward to another user without retrieving the data back. This is an attempt to provide light-weight approach which protects data access in distributed storage servers. User can implement all important concept i.e. Confidentiality for security, Robustness for healthy data, Reliability for flexible data, Availability for compulsory data will be achieved to another user which is store in cloud and easily overcome problem of “Securely data forwarding and maintaining, reliability of data in cloud computing “using different type of Methodology and Technology.
Secure Data Sharing In an Untrusted CloudIJERA Editor
Cloud computing is a huge area which basically provides many services on the basis of pay as you go. One of the fundamental services provided by cloud is data storage. Cloud provides cost efficiency and an efficient solution for sharing resource among cloud users. A secure and efficient data sharing scheme for groups in cloud is not an easy task. On one hand customers are not ready to share their identity but on other hand want to enjoy the cost efficiency provided by the cloud. It needs to provide identity privacy, multiple owner and dynamic data sharing without getting effected by the number of cloud users revoked. In this paper, any member of a group can completely enjoy the data storing and sharing services by the cloud. A secure data sharing scheme for dynamic cloud users is proposed in this paper. For which it uses group signature and dynamic broadcast encryption techniques such that any user in a group can share the information in a secured manner. Additionally the permission option is proposed for the security reasons. This means the file access permissions are generated by the admin and given to the user using Role Based Access Control (RBA) algorithm. The file access permissions are read, write and delete. In this, owner can provide files with options and accepts the users using that option. The revocation of cloud user is a function generated by the Admin for security purpose. The encryption computational cost and storage overhead is not dependent on the number of users revoked. We analyze the security by proofs and produce the cloud efficiency report using cloudsim.
iaetsd Preserving private multi keyword searching with ranking by anonymous i...Iaetsd Iaetsd
This document discusses privacy-preserving multi-keyword ranked search over encrypted cloud data. It proposes assigning anonymous IDs to cloud users to hide their identities from the cloud service provider and better protect sensitive data on the cloud. The system allows data owners to encrypt and outsource data to the cloud for storage. It then builds a searchable index to allow authorized users to search for keywords without learning the content. The cloud server ranks search results based on relevance but hides information about important documents. Previous works focused on search and privacy but revealed user identities. The proposed system addresses this by anonymizing user IDs to maintain privacy under two threat models.
IRJET-Using Downtoken Secure Group Data Sharing on CloudIRJET Journal
The document proposes a secure group data sharing scheme on cloud using key aggregate search encryption (KASE). In the proposed scheme, a data owner can generate a single download token (DT) to share a group of encrypted files with multiple users. The users only need to upload the DT to the cloud to search and download the shared files. This reduces the complexity of managing multiple encryption keys compared to traditional schemes. The scheme provides security, dynamic changes, low computation and communication costs for file access and key updates.
A Privacy Preserving Attribute Based Access Control Mechanism In Distributed ...Editor IJCATR
We propose a new decentralized access control scheme for secure data storage in clouds that supports anonymous
authentication. In the proposed scheme, the cloud verifies the authenticity of the series without knowing the user’s identity before
storing data. Our scheme also has the added feature of access control in which only valid users are able to decrypt the stored
information. The scheme prevents replay attacks and supports creation, modification, and reading data stored in the cloud. We also
address user revocation. Moreover, our authentication and access control scheme is decentralized and robust, unlike other access
control schemes designed for clouds which are centralized. The communication, computation, and storage overheads are comparable
to centralized approaches.
A secure-anti-collusion-data-sharing-scheme-for-dynamic-groups-in-the-cloudPvrtechnologies Nellore
This document proposes a secure data sharing scheme for dynamic groups in the cloud. It allows group members to securely access and share data files stored in the cloud. The scheme provides secure key distribution without requiring secure communication channels. It also enables fine-grained access control and prevents collusion attacks between revoked users and the cloud. When users join or leave the group, other users do not need to update their private keys. The scheme aims to address limitations of existing approaches that require updating file-block keys for revocations and have overhead linearly increasing with member/revocation changes.
This document summarizes a proposed scheme for secure data sharing in dynamic groups in the cloud. It addresses key challenges including how to securely share data with fine-grained access control when group membership changes frequently. The proposed scheme uses key policy attribute-based encryption (KP-ABE) and group signatures to allow any cloud user to anonymously share data. It leverages techniques like dynamic broadcast encryption and signed receipts to reduce computation and storage overhead, making the costs independent of the number of revoked users. The scheme aims to enable secure multi-owner data sharing where attribute authorities are also dynamic.
Mona secure multi owner data sharing for dynamic groups in the cloudJPINFOTECH JAYAPRAKASH
The document proposes a secure multi-owner data sharing scheme called Mona for dynamic groups in the cloud. Mona allows any user in a group to anonymously share data with others in the cloud using group signatures and dynamic broadcast encryption. It aims to address challenges with existing schemes that have complexities increasing linearly with the number of owners and revoked users. The proposed Mona scheme achieves independent storage overhead and encryption costs from the number of revoked users and supports dynamic groups where new users can access previous files without owners.
IRJET- Security Enhancement for Sharing Data within Group Members in CloudIRJET Journal
1) The document proposes a secure data sharing scheme for sharing data within group members in the cloud. It aims to prevent collusion attacks and allow for secure sharing of data even as group membership changes dynamically.
2) The scheme uses encryption with private keys so that if a user's key is leaked, it will be difficult for others to access the shared data. A trusted authority authenticates users and stores encryption keys to determine responsibility if issues arise.
3) The scheme achieves secure key distribution without requiring secure communication channels by using public key verification. It also allows for fine-grained access control and secure revocation such that revoked users cannot access shared data even by colluding with the cloud.
This summarizes a research paper about an encryption-based secure data sharing and storage scheme for multi-user dynamic groups in the cloud. The proposed scheme leverages group signatures and dynamic broadcast encryption to allow any cloud user to anonymously share data while preserving identity privacy. It ensures storage overhead and encryption costs are independent of the number of users. The scheme provides security analysis and experiments demonstrating efficiency.
Review on Key Based Encryption Scheme for Secure Data Sharing on CloudIRJET Journal
This document reviews key-based encryption schemes for secure data sharing on cloud. It discusses how traditional encryption techniques are not suitable for large scale data sharing due to complex key management. A key-based encryption scheme is proposed that allows a data owner to generate an aggregate encryption key and submit a single aggregate trapdoor for keyword search. This reduces key management complexity and the number of trapdoors needed compared to traditional techniques. The proposed scheme uses seven polynomial algorithms for security including key generation, encryption, key extraction and trapdoor generation. It aims to provide an effective solution for secure and scalable data sharing using cloud storage.
Anonymous Key Based Secure File Encryption in CloudIRJET Journal
This document proposes a new system for secure file encryption and sharing in the cloud. It aims to address security issues with sharing data in social media. The key aspects of the proposed system are:
1. It creates separate databases for individual users and a local server to securely store user keys for encryption/decryption.
2. Files are encrypted using triple DES before being stored in the cloud to prevent unauthorized access.
3. A user can share files with others by providing encryption keys through the local server.
4. When a file is shared, a temporary server decrypts and re-encrypts the file with the recipient's key for added security.
The system aims to improve data security when
IRJET- A Research Paper on Block Design-based Key Agreement for Group Dat...IRJET Journal
This document summarizes a research paper that proposes a new method for secure group data sharing and key agreement in cloud computing. The proposed method uses block design to distribute keys without requiring a secure communication channel. It stores encrypted data across multiple clouds to prevent collusion attacks. The system provides two layers of encryption and fine-grained access control for dynamic groups. It aims to address security issues with existing approaches like single cloud storage and insecure key distribution.
Multi Owner Data Sharing & Outsourced Revocation Using Identity Based Encrypt...Eswar Publications
Cloud computing is an economical and effective solution for sharing group resource among cloud users. Unfortunately, sharing data in a multi-owner manner while protect data and identity privacy from an un trusted cloud is still a challenging issue, due to the recurrent change of the membership.The major aims of this method a secure multi-owner data sharing scheme.That is any user in the group can securely share data with others by un trusted cloud. Moreover, the real identities of data owners can be exposed by the group manager when disputes occur. User revocation can be achieved by a novel revocation list and no need to update the secret Keys of the
remaining users.The drawback of IBE is computation over head. To overcome the drawback introduces outsourcing computation.
IRJET- Secure Data Sharing Scheme for Mobile Cloud Computing using SEDASCIRJET Journal
1) The document proposes a Secure Data Sharing in Clouds (SeDaSC) methodology for secure data sharing in cloud computing.
2) SeDaSC provides data confidentiality and integrity, access control, secure data sharing without reencryption, protection from insider threats, and forward/backward access control.
3) The methodology encrypts files with a single encryption key and distributes key shares to users and a cryptographic server to counter insider threats while allowing authorized access.
Mona secure multi owner data sharing for dynamic groups in the cloudJPINFOTECH JAYAPRAKASH
This document summarizes the "Mona: Secure Multi-Owner Data Sharing for Dynamic Groups in the Cloud" paper. It proposes a scheme called Mona that allows any user in a dynamic group to anonymously share data on the cloud. Mona uses group signatures and dynamic broadcast encryption so encryption costs are independent of revoked users. It provides anonymous yet traceable access control and efficient user revocation without updating keys.
The capability of involving the selection sharing encrypted data with different users via public
cloud storage may greatly ease security concerns over not intended data leaks in the cloud. A key
challenge to designing such encryption schemes to be sustainable in the efficient management of
encryption keys. The desired flexibility of sharing any group of selected documents with any group of
users need for something different encryption keys to be used for different documents. However, this
also implies the urgent need of securely distributing to users a large number of keys for both encryption
and search, and those users will have to protected from danger store the received keys, and submit an
equally large number of keyword trapdoors to the cloud in order to perform search over the shared data
implied need for secure communication, storage, and complexity clearly to give to someone the
approach impractical. In this work a data owner only needs to distribute a single key to a user for
sharing a very large number of documents, and the user only needs to submit a single trapdoor to the
cloud for querying the shared documents. User Revocation is used for Key Updation. Forward Secrecy
and Backward Secrecy is used.
Achieving Secure, sclable and finegrained Cloud computing reportKiran Girase
cloud computing is also facing many challenges that, if not well resolved, may impede its fast growth. Data security, as it exists in many other applications, is among these challenges that would raise great concerns from users when they store sensitive information on cloud servers. These concerns originate from the fact that cloud servers are usually operated by commercial providers which are very likely to be outside of the trusted domain of the users. Data confidential against cloud servers is hence frequently desired when users outsource data for storage in the cloud.
Secure Redundant Data Avoidance over Multi-Cloud Architecture. IJCERT JOURNAL
Redundant data avoidance systems, the Private Cloud are involved as a proxy to allow data owner/users to securely perform duplicate check with differential privileges. Such architecture is practical and has attracted much attention from researchers. The data owners only outsource their data storage by utilizing public cloud while the data operation is managed in private cloud, in this connection our presented system has follows traditional encryption while providing data confidentiality, is incompatible with redundant data avoidance. Identical data copies of different users will lead to different ciphertexts, making data avoidance impossible. To address above issues convergent encryption technique has been proposed to encrypt the data before outsourcing. To better protect data security, this paper makes the first attempt to formally address the problem of authorized redundant data avoidance. Different from traditional redundant data avoidance systems, the differential privileges of users are further considered in duplicate check besides the data itself. We also present several new redundant data avoidance constructions supporting authorized duplicate check in a multi-cloud architecture. Security analysis demonstrates that our scheme is secure in terms of the definitions specified in the proposed security model. In order to perform secure access controlling scheme user may satisfy fine-grained approach at cloud level towards access restricting from unauthorized users or adversaries.
This document discusses enforcing multi-user security policies in cloud computing. It describes using key-policy attribute-based encryption (KP-ABE) to allow flexible and fine-grained access control of encrypted data stored on cloud servers. The database is encrypted using KP-ABE before being stored. A key management authority generates key sets for authorized users to decrypt portions of the database according to assigned access policies. This allows complex queries to be run on the encrypted database while protecting data confidentiality even from the cloud server.
This document discusses enforcing multi-user security policies in cloud computing. It describes using key-policy attribute-based encryption (KP-ABE) to allow flexible and fine-grained access control of encrypted data stored on cloud servers. The database is encrypted using KP-ABE before being stored. The key management authority generates key sets for authorized users that determine which attributes they can access. This allows complex queries to be run on the encrypted database while maintaining security and privacy.
Fragmentation of Data in Large-Scale System For Ideal Performance and SecurityEditor IJCATR
Cloud computing is becoming prominent trend which offers the number of significant advantages. One of the ground laying
advantage of the cloud computing is the pay-as-per-use, where according to the use of the services, the customer has to pay. At present,
user’s storage availability improves the data generation. There is requiring farming out such large amount of data. There is indefinite
large number of Cloud Service Providers (CSP). The Cloud Service Providers is increasing trend for many number of organizations and
as well as for the customers that decreases the burden of the maintenance and local data storage. In cloud computing transferring data to
the third party administrator control will give rise to security concerns. Within the cloud, compromisation of data may occur due to
attacks by the unauthorized users and nodes. So, in order to protect the data in cloud the higher security measures are required and also
to provide security for the optimization of the data retrieval time. The proposed system will approach the issues of security and
performance. Initially in the DROPS methodology, the division of the files into fragments is done and replication of those fragmented
data over the cloud node is performed. Single fragment of particular file can be stored on each of the nodes which ensure that no
meaningful information is shown to an attacker on a successful attack. The separation of the nodes is done by T-Coloring in order to
prohibit an attacker to guess the fragment’s location. The complete data security is ensured by DROPS methodology
1. The document proposes a system for secure user authentication and access control for encrypted data stored in the cloud. It aims to address issues with centralized access control and storing data in plaintext.
2. The proposed system uses a key distribution center to generate public, private, and access keys for authentication at different levels. Data is encrypted before being fragmented and distributed across multiple servers.
3. Only authorized users with proper keys can decrypt the data. Access policies set by data creators restrict which users can access files. Storing encrypted and distributed data along with key-based authentication aims to improve security over existing cloud storage systems.
A robust and verifiable threshold multi authority access control system in pu...IJARIIT
Attribute-based Encryption is observed as a promising cryptographic leading tool to assurance data owners’ direct
regulator over their data in public cloud storage. The former ABE schemes include only one authority to maintain the whole
attribute set, which can carry a single-point bottleneck on both security and performance. Then, certain multi-authority
schemes are planned, in which numerous authorities distinctly maintain split attribute subsets. However, the single-point
bottleneck problem remains unsolved. In this survey paper, from another perspective, we conduct a threshold multi-authority
CP-ABE access control scheme for public cloud storage, named TMACS, in which multiple authorities jointly manage a
uniform attribute set. In TMACS, taking advantage of (t, n) threshold secret allocation, the master key can be shared among
multiple authorities, and a lawful user can generate his/her secret key by interacting with any t authorities. Security and
performance analysis results show that TMACS is not only verifiable secure when less than t authorities are compromised, but
also robust when no less than t authorities are alive in the system. Also, by efficiently combining the traditional multi-authority
scheme with TMACS, we construct a hybrid one, which satisfies the scenario of attributes coming from different authorities as
well as achieving security and system-level robustness.
IRJET- A Review on Lightweight Secure Data Sharing Scheme for Mobile Cloud Co...IRJET Journal
This document reviews a proposed lightweight secure data sharing scheme (LDSS) for mobile cloud computing. It aims to address the problems of high computational overhead for mobile devices and lack of security when data is stored and shared in the cloud. The proposed LDSS framework uses attribute-based encryption and proxy servers to perform intensive encryption and decryption tasks, reducing the computational load on mobile clients. It also introduces lazy re-encryption and attribute fields to help efficiently revoke user access privileges. The goal is to provide secure yet lightweight data sharing capabilities for mobile cloud applications and services.
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components of Natural Language Generation,
followed by a review of the history and progression of
NLP. Subsequently, we delve into the current state of
the art by presenting diverse NLP applications,
contemporary trends, and challenges. Finally, we
discuss some available datasets, models, and
evaluation metrics in NLP.
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Networking is a telecommunications network that allows computers to exchange data. In
computer networks, networked computing devices pass data to each other along data
connections. Data is transferred in the form of packets. The connections between nodes are
established using either cable media or wireless media.
Iaetsd secure data sharing of multi-owner groups in cloud
1. Secure Data Sharing of Multi-Owner Groups in Cloud
1
Sunilkumar Permkonda , 2
D. Madhu Babu
ABSTRACT: Cloud computing provides an economical and
efficient solution for sharing group resource among cloud users.
Using cloud storage, users can remotely store their data a and
enjoy the on-demand high quality application and services from a
shared pool of configurable computing resources, without the
burden of local data storage and maintenance. However, the fact
that users no longer have physical possession of the outsourced
data makes the data integrity protection in cloud computing a
formidable task, especially for users with constrained computing
resources. Sharing data in multi-owner manner while preserving
data and identity privacy from an un strusted cloud is still a
challenging issues. So, secure cloud authentication system has
been proposed, in which users can check the integrity of
outsourced data by assigning a third party auditor (TPA) and be
worry-free. By using an encryption and hashing technique such
as Advanced Encryption Standard (AES),Merkle Hash
Tree(MHT) algorithm, any cloud users can anonymously share
data with others. Also trustworthiness will be increased between
the user and the cloud service provider.
KEYWORDS: Cloud computing, data sharing, privacy-
preserving, access control, dynamic groups.
1. INTRODUCTION
Cloud Computing is recognized as an alternative to
traditional information technology due to its intrinsic resource
sharing and low-maintenance characteristics. In cloud
computing ,the cloud service provider(CSPs),such as Amazon,
are able to deliver various services to cloud users with the
help of powerful datacenters. By migrating the local data
management systems into cloud servers, users can enjoy high-
quality services and save significant investments on their local
infrastructures.
1
Sunilkumar Permkonda, M. Tech Student, Department of
CSE, JNTUA, Anantapur/ Audisankara Institute of
Technology, Gudur /India, (e-mail:
sunil55varma@gmail.com).
2
D.Madhu Babu, Assistant Professor Department of CSE,
JNTUA/ Anantapur/ Audisankara Institute of Technology,
Gudur /India,( e-mail: dmadhubabu@yahoo.com).
One of the most fundamental services offered by cloud
providers is data storage. By utilizing the cloud ,the users can
be completely released from the troublesome local data
storage and maintenance. However, It also poses a significant
risk to the confidentiality of those stored files. Specifically, the
cloud servers managed by cloud providers are not fully trusted
by users while the data files stored in cloud may be sensitive
and confidential, such as business plans. To preserve data
privacy, as basic solution is to encrypted data files, and then
upload the encrypted data into the cloud. Unfortunately.
Designing an efficient and secure data sharing schema for
groups in the cloud is not an easy task due to the following
challenging issues.
First, identity privacy is one of the most significant
obstacles is one the wide deployment of cloud computing .
Without the guarantee of identity privacy, users may be
unwilling to join in cloud computing systems because their
identities could be easily disclosed to cloud providers and
attackers.
Second it is highly recommended that any member in a
group should be able to fully enjoy the data storing and
sharing services provided by the cloud , which is defined as
the multi-owner manner. Compared with the single-owner
manner, where only the group manager can store and modify
data in the cloud , the multiple-owner manner is more flexible
in practical applications. More concretely, each user in the
group is able to not only read data , but also modify their part
of data in the entire data file shared by the company. groups
are normally dynamic in practice, e.g., new staff participation
and current employee revocation in a company. The changes
of membership make secure data sharing extremely difficult.
On one hand , the anonymous system challenges new granted
users to learn the content of data files stored before their
participation, because it is impossible for new ranted users to
contact with anonymous data owners, and obtain the
corresponding decryption keys. On the other hand, an efficient
membership revocation mechanism without updating the
secret keys of the remaining users is also desired to minimize
the complexity of key management.
Several security schemes for data sharing on un
trusted servers have been proposed. In these approaches, data
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2. owners store the encrypted data files in un trusted storage the
encrypted and distribute the corresponding decryption keys
only to authorizes users. Thus, unauthorized users as well as
storage servers can't learn the content of the data files because
they have no knowledge of the decryption keys. However the
complexities of user participation and revocation in these
schemes are linearly increasing with the number of data
owner and the number of revoked users, respectively. By
setting a group with a single attribute, Lu et al. proposed a
secure provenance scheme based on the cipher text-policy
attribute-based encryption technique, which allows any
member in group to share data with others. However, the issue
of user revocation is not addressed in their scheme presented a
scalable and fine-grained data access control scheme in cloud
computing based o the Key policy attribute-based
encryption(KP-ABE) technique. unfortunately, the single
owner manner hinders the adoption of their scheme into the
case , where any user is ranted to store and share data.
2. RELATED WORKS
Several security schemes for data sharing on un trusted servers
have been proposed [4], [5], [6]. In these approaches, data
owners store the encrypted data files in un trusted storage and
distribute the corresponding decryption keys only to
authorized users. Thus, unauthorized users as well as storage
servers cannot learn the content of the data files because they
have no knowledge of the decryption keys.
Proposed a cryptographic storage system that enables secure
file sharing on un trusted servers, named plutus. By dividing
files into file groups and encrypting each file group with a
unique file-block key, the data owner can share the file groups
with others through delivering the corresponding lockbox
key, where the lockbox key is used to encrypt the file-block
keys. However, it brings about a heavy key distribution
overhead for large-scale file sharing. Additionally, the file-
block key needs to be updated and distributed again for a user
revocation. Files stored on the un trusted server include two
parts: file metadata and file data. The file metadata implies the
access control information including a series of encrypted key
blocks, each of which is encrypted under the public key of
authorized users. Thus, the size of the file metadata is
proportional to the number of authorized users. The user
revocation in the scheme is an intractable issue especially for
large-scale sharing, since the file metadata needs to be
updated. In their extension version, the NNL construction is
used for efficient key revocation. However, when a new user
joins the group, the private key of each user in an NNL system
needs to be recomputed, which may limit the application for
dynamic groups. Another concern is that the computation
overhead of encryption linearly increases with the sharing
scale.
Leveraged proxy re-encryptions to secure distributed storage.
Specifically, the data owner encrypts blocks of content with
unique and symmetric content keys, which are further
encrypted under a master public key. For access control, the
server uses proxy cryptography to directly re encrypt the
appropriate content key(s) from the master public key to a
granted user’s public key. Unfortunately, a collusion attack
between the un trusted server and any revoked malicious user
can e launched, which enables them to learn the decryption
keys of all the encrypted blocks.
3.CLOUD COMPUTING SECURITY
Cloud Computing Security as “Cloud computing security
(sometimes referred to simply as "cloud security") is an
evolving sub-domain of computer security, network security,
and, more broadly, information security. It refers to a broad set
of policies, technologies, and controls deployed to protect
data, applications, and the associated infrastructure of cloud
computing.”
3.1 Data Security in Existing Cloud Computing System:
Cloud Computing is the vast developing technology, but
Security is the major challenging issue that is faced by the
Cloud Service Providers for handling the Outsourced Data.
Although the infrastructures under the cloud are much more
powerful and reliable than personal computing devices, they
are still facing the broad range of both internal and external
threats for data integrity. Thus, Trustworthiness for Data
Management system reduced rapidly. To overcome this
drawback, there is no big implementation was introduced till
now. By using this drawback of the cloud, the hackers are
hacking the data from the Cloud Servers. Dynamic broadcast
encryption technique is used and users can anonymously share
data with others .It allows the data owners to securely share
data files with others.
To achieve secure data sharing for dynamic groups in the
cloud, we expect to combine the group signature and dynamic
broadcast encryption techniques. Specially, the group
signature scheme enables users to anonymously use the cloud
resources, and the dynamic broadcast encryption technique
allows data owners to securely share their data files with
others including new joining users. Unfortunately, each user
has to compute revocation parameters to protect the
confidentiality from the revoked users in the dynamic
broadcast encryption scheme, which results in that both the
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3. computation overhead of the encryption and the size of the
ciphertext increase with the number of revoked users. Thus,
the heavy overhead and large ciphertext size may hinder the
adoption of the broadcast encryption scheme to capacity-
limited users. To tackle this challenging issue, we let the
group manager compute the revocation parameters and make
the result public available by migrating them into the cloud.
Such a design can significantly reduce the computation
overhead of users to encrypt files and the cipher text size.
Specially, the computations overhead of users for encryption
operations and the cipher text size are constant and
independent of the revocation users.
From the above analysis, we can observe that how to securely
share data files in a multiple-owner manner for dynamic
groups while preserving identity privacy from an un trusted
cloud remains to be a challenging issue. In this paper, we
propose a novel Mona protocol for secure data sharing in
cloud computing. Compared with the existing works, Mona
offers unique features as follows:
1. Any user in the group can store and share data files
with others by the cloud.
2. The encryption complexity and size of cipher texts
are independent with the number of revoked users in
the system.
3. User revocation can be achieved without updating the
private keys of the remaining users.
4. A new user can directly decrypt the files stored in the
cloud before his participation.
4. PROPOSED CLOUD DATA SECURITY MODEL
To overcome this drawback, we propose secure storage for
multi-owner data sharing authentication system in loud. If data
owner wants to upload data in cloud, Public and Private Keys
will be generated for that user. He first encrypts the data using
Advance Encryption Standard algorithm and then hashes the
encrypted data using Merkle Hash Tree algorithm. Then the
data will be given to the Trusted Party Auditor for auditing
purpose. The Auditor audits the data using Merkle Hash Tree
Algorithm and stores in the Cloud Service Provider. If the user
wants to View/Download the data, they have to provide the
public key. The Data Owners will check the public key
entered by the User. If valid, then the decryption key will be
provided to the user to encrypt the data.
4.1 OVERALL DESIGN:
The following figure shows the overall architecture
of proposed system.Here the data is stored in a secure manner
in cloud and TPA audits the data to verify its integrity. If any
part of data is modified or corrupted, then mail alert is sent to
the data owner to indicate that the file has been changed.
Figure: System model.
4.2 DATA SECURITY
Once Data Owners registers in the cloud, private and
public keys are generated for that registered owners. By using
these keys, data owners can now store and retrieve data from
cloud. A data owner encrypts the data using Advanced
Encryption Standard (AES) and this encrypted data is then
hashed with Merkle Hash Tree algorithm. By using Merkle
Hash Tree algorithm the data will be audited via multiple level
of batch auditing process. The top hash value is stored in local
database and other hash code files are stored in cloud. Thus
the original data cannot be retrieved by anyone from cloud,
since the top hash value is not in cloud. Even if any part of
data gets hacked, it is of no use to the hacker. Thus, the
security can be ensured
4.3DATA INTEGRITY:
To check whether the data is modified or not, that is
present in cloud, data owner assigns a third party called
Trusted Party Auditor (TPA). Once the data owner sends the
request to audit the data, TPA checks the integrity of the data
by getting the hash code files from cloud server and top hash
value from db and verifies the file using Merkle Hash Tree
Algorithm. After each time period, the auditing information
will be updated by the Trusted Party Auditor. If any file is
missing or corrupted, email alert will be sent to data owner
indicating that the data has been modified. The TPA can verify
the file either by random or in manual way. Thus by allowing
the Trusted Party Auditor to audit the data, Trustworthiness
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4. will be increased between the User and Cloud service
Providers.
Our contributions: To solve the challenges presented above,
we propose Mona, a secure multi-owner data sharing scheme
for dynamic groups in the cloud. The main contributions of
this paper include:
1. We propose a secure multi-owner data sharing
scheme. It implies that any user in the group can
securely share data with others by the un trusted
cloud.
2. Our proposed scheme is able to support dynamic
groups efficiently. Specifically, new granted users
can directly decrypt data files uploaded before their
participation without contacting with data owners.
User revocation can be easily achieved through a
novel revocation list without updating the secret keys
of the remaining users. The size and computation
overhead of encryption are constant and independent
with the number of revoked users.
3. We provide secure and privacy-preserving access
control to users, which guarantees any member in a
group to anonymously utilize the cloud resource.
Moreover, the real identities of data owners can be
revealed by the group manager when disputes occur.
4. We provide rigorous security analysis, and perform
extensive simulations to demonstrate the efficiency
of our scheme in terms of storage and computation
overhead.
4.4 USER AUTHENTICATION:-
In this module, the user is allowed to access the
information from the Cloud Server. When a user registers in
cloud, private key and public key will be generated for that
user by cloud server. If user wants to view his own file, he
uses private key. If user wants to view others file, he uses
public key. This public key is split up equally for verification
by data owners. Each part of the public key is verified by data
owners. After verifying the key, if the key is valid, then user is
allowed to access the data. If the key is invalid, then the user is
rejected to access the data by Cloud Service Provider.
We consider a cloud computing architecture by combining
with an example that a company uses a cloud to enable its
staffs in the same group or department to share files. The
system model consists of three different entities: the cloud, a
group manager (i.e., the company manager), and a large
number of group members (i.e., the staffs) as illustrated in Fig.
1.
Group manager takes charge of system parameters
generation, user registration, user revocation, and revealing
the real identity of a dispute data owner. In the given example,
the group manager is acted by the administrator of the
company. Therefore, we assume that the group manager is
fully trusted by the other parties. Group members are a set of
registered users that will store their private data into the cloud
server and share them with others in the group. In our
example, the staffs play the role of group members. Note that,
the group membership is dynamically changed, due to the staff
resignation and new employee participation in the company.
Cloud is operated by CSPs and provides priced abundant
storage services. However, the cloud is not fully trusted by
users since the CSPs are very likely to be outside of the cloud
users’ trusted domain. Similar to [3], [7], we assume that the
cloud server is honest but curious. That is, the cloud server
will not maliciously delete or modify user data due to the
protection of data auditing schemes [17], [18], but will try to
learn the content of the stored data and the identities of cloud
users.
4.5 ADVANTAGES
By providing the Public and Private key components,
only the valid user will be allowed to access the data.
By allowing the Trusted party Auditorto audit the
data, Trustworthiness will be increased between the
User and Cloud ServiceProviders.
By using Merkle Hash Tree Algorithm the data will
be audited via multiple level of batch auditing
Process.
As Business Point of view, the Company’s
Customers will be increased due to the Security and
Auditing Process.
Anonymity and traceability: Anonymity guarantees that
group members can access the cloud without revealing the real
identity. Although anonymity represents an effective
protection for user identity, it also poses a potential inside
attack risk to the system. For example, an inside attacker may
store and share a mendacious information to derive substantial
benefit. Thus, to tackle the inside attack, the group manager
should have the ability to reveal the real identities of data
owners.
Efficiency: The efficiency is defined as follows: Any
group member can store and share data files with others in the
group by the cloud . User revocation can be achieved without
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5. involving the remaining users. That is, the remaining users do
not need to update their private keys or re-encryption
operations. New granted users can learn all the content data
files stored before his participation without contacting with the
data owner.
5. CONCULSION
Data is secured by keeping the top hash value in local
database and hash code files in Cloud Server. By enabling
TPA to audit he data, integrity is maintained. Authenticating
the requested user key by all data owners. we design a secure
data sharing scheme, Mona, for dynamic groups in an un
trusted cloud. In Mona, a user is able to share data with others
in the group without revealing identity privacy to the cloud.
Additionally, Mona supports efficient user revocation and new
user joining. More specially, efficient user revocation can be
achieved through a public revocation list without updating the
private keys of the remaining users, and new users can directly
decrypt files stored in the cloud before their participation.
Moreover, the storage overhead and the encryption
computation cost are constant. Extensive analyses show that
our proposed scheme satisfies the desired security
requirements and guarantees efficiency as well.
6. REFERENCES
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