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Cloud computing has become an integral part of most of the private and public organizations and being used for data storage and retrieval. There are many usage of cloud computing and widely used in highly confidential national services like military and treasury for storing confidential information. The cloud computing for example Google drive, Amazon Web Service and Microsoft Azure are beneficial for organizations and end-users. Using Cloud computing and its services, organisation/end-users can store their data. There are multiple challenges while saving organisations highly confidential documents in servers. Hence, the objective of this paper is to provide a high level design for a storage system maximising security and personal privacy. Though servers are highly protected against unauthorized access, there are incidents where confidential files stored on servers are accessed by the maintenance staffs. Hence this research paper provides introductory structure for fully protection of files stored in the server by using Hybrid Cryptosystem.
![International Journal of Innovative Research in Information Security (IJIRIS) ISSN: 2349-7017
Issue 11, Volume 4 (November 2017) www.ijiris.com
_________________________________________________________________________________________________
IJIRIS: Impact Factor Value – SJIF: Innospace, Morocco (2016): 4.651
Indexcopernicus: (ICV 2015): 73.48
© 2014- 17, IJIRIS- All Rights Reserved Page -2
While accessing the data on cloud front end interface, business layer and data storage layers are used. Though the
front end resides on user computer but the business and data layers reside on service provider premises. Hence
the encryption algorithm is implemented by the cloud service provider. The challenge in encryption is that more
complex logic slows down the reading and writing of the files on the server and hence the algorithm is applied only
when it is needed. Encryption algorithm helps to solve this problem by encrypting the files. This purpose of this
research is to present a file security model for the solution of security issue in cloud environment. In this model,
hybrid encryption is used where files are encrypted by 6 algorithms coupled with file splitting which is used for the
secured communication between users and the servers.
II. LITERATURE REVIEW AND EXISTING SYSTEM
Data Security Issues [5] are main issue in the existing system. Due to openness and multi-tenant characteristics of
the cloud, the traditional security mechanisms are no longer suitable for applications and data in cloud. Some of the
issues are as following:
1. Due to dynamic scalability, service and location transparency features of cloud computing model, all kinds of
application and data of the cloud platform have no fixed infrastructure and security boundaries. In the event of
security breach, it is difficult to isolate a particular resource that has a threat or has been compromised.
2. According to service delivery models of Cloud computing, resources and cloud services may be owned by
multiple providers. As there is a conflict of interest, it is difficult to deploy a unified security measure.
3. Due to the openness of cloud and sharing virtualized resources by multitenant, user data may be accessed by
other unauthorized users.
The word cryptography means changing the message data into a scrambled code which can be retrieved back on
open network. Cryptography technique secures the sensitive information in unsecured transmission networks and
which can be read by intended recipient. A cryptography algorithm needs a key along with a message of any format
to form the cipher text. The level of security of cipher text depends on the strength of cryptographic algorithm and
privacy of the cryptographic key used. Thus the first level of security has been provided. Further security can be
improved using yet another Data hiding technique, Setganography. In this proposed system AES, DES, RC2
algorithms are used to provide block wise security to data. Key information security is implemented by using LSB
steganography technique. The purpose of Key information is to decide link between available algorithm and key
file encryption. By using this technique the file is fragmented into three parts and each part uses unique algorithm
technique. Multithreading is used to encrypt every part of file simultaneously for improving the performance. LSB
technique is used to insert Data encryption Keys into cover image. Valid user receives an email with Stego-Image of
the key. Reverse process of encryption is applied for file decryption purpose. Symmetric key cryptography
algorithms are AES, DES, 3DES, IDEA, BRA, ECB, CBC and blowfish [3]. These algorithms accomplished high level
security but increase delay for data encode and decode. Steganography hide the secret data existence into envelope.
In this technique existence of data is not visible to all people. Only valid receiver knows about the data existence.
Image steganography technique is used to produce high security for data. Secret data of user hide into image file.
After adding text into image file it looks like normal image file. DES algorithm is used for text encode and decode.
Advantage of image steganography technique is providing security to text.
Three bit LSB technique used for image steganography. We can hide huge amount of into image using LSB
steganography technique. AES is symmetric key cryptography algorithm. It supports three types of keys. For 128
bit key require 10 rounds, 192 bit key require 12 rounds and 256 bit key require 14 rounds [6]. In improved AES
algorithm encryption and decryption time is reduced .Advantage of modified AES algorithm is provides better
performance in terms of delay [1]. DES applies a single key for texts encode and decode. Size of key is 128 bit. In
this algorithm many steps are executed randomly so illegitimate user cannot even guess the steps of algorithm.
Provide high throughput is one of the advantages of symmetric key cryptography algorithms. [4] Improved DES
algorithm uses 112 bit key size for data encode and decode. Key generation process is done using random key
generation technique. It provides security to data. Disadvantage of this algorithm is essential maximum time for
converting data into cipher text because it operates on single byte at a time.
III.PROPOSED SYSTEM
The solution of the asymmetric cryptography is enhanced with the additional layer of security by combining AES,
DES, RC6, ECB, CBC, Triple DES algorithms. The proposed system is a process development for file security issues
in storage systems. Same concept as of cloud computing is implemented with new technique and method, where
user can store data and can access it using proposed system. The overall proposed system structure is shown as
below figure 1.](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
