Volume : 4, Issue : 7, July - 2015

Secure Scalable Data Sharing in Cloud Storage using Randomized Key Aggregate Crypto System

Vaddi Nagamani, Vedula Venkateswara Rao, Mandapati Venkateswara Rao

Abstract :

<p>Now a days cloud computing is emerging computing technology in computing world. Cloud computing provides integration of several servers, storage space as a single entity. The cloud computing provides interconnection of several physical computing resources as a single entity so that the customers can use them on pay per use method. The cloud computing also uses virtualization technology to increase the computing resources so that with minimum resources we can implement work efficiently. Cloud provides different layers in its architecture so that the users can use all the resources in cloud as service model. In this cloud computing environment cloud storage is one of the services that are most popular in present world. Data sharing is an important functionality in cloud storage in this case the data placed by user may shared and accessed by many users in such a case the data sharing must be secure, flexible and efficient with others. Clod computing had overlaps many existing concepts such as distributed system. Data security is the challenging issue in cloud computing paradigm where the user store sensitive information on cloud servers. Also, data confidentiality against cloud server is required, when users outsource data for storage in the cloud. Existing solutions generally use cryptographic methods like encryption and decryption. The biggest concerns with cloud data storage is that of data integrity verification at untrusted server. To preserve data privacy, a basic solution is to encrypt data files, and then upload the encrypted data into the cloud. For this it is proposed to have a public key cryptosystem for storing and accessing for data in cloud. In existing system this cryptosystem produces constant size cipher text. Now this system proposes to introduce variable size cryptosystem that is supported with a set of secret keys as a single keys and the process uses the power of the all the keys by using these compact aggregate key we encrypt files and storing cloud. This key is positive others who shares the data. By using this key others can share data in secured way.</p>