SECURED DATA SHARING FOR CLOUD GROUP USERS USING PUBLIC AUDITING MECHANISM

Cloud Computing

Cloud storage is widely used for sharing data due to low cost maintenance. But, it is also necessary to secure data on cloud. Secure Data Sharing in Cloud focuses mainly on: a)Data recovery b) privacy and confidentiality c) key management and encryption d) secure data sharing without re-encryption and e) forward and backward access control f) Prevention of data tampering. When user wants to share data, it sends request to trusted party that generates a symmetric key which is used to encrypt the data for sharing. This key is used to compute two key shares for trusted party and user. For security purpose, once a user is revoked from the group, the blocks which were formerly signed by this revoked user need to be re-signed by an current user. In this paper, we propose a new privacy-aware public auditing mechanism for shared cloud data by constructing a homomorphic verifiable group signature. Unlike the existing solutions, our scheme requires at least m group managers to restore a trace key unitedly, which wipe out the misuse of single-authority power and provides nonframeability. Our system provides the public checking and efficient user revocation facility and also some nice properties, such as confidently, efficiency, countability and traceability of secure group user revocation. We also present an extension of our proposed scheme that enables the TPA to operate multiple auditing tasks at the same time.. Finally ,the security and experimental analysis show that, compared with schemes our scheme is also secure and efficient.

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