ENCHANCED PRIVACY PRESERVING FOR PUBLIC AUDITING WITH SHARED DATA IN THE CLOUD

Author(s):

Ms. S.SHABRIN , IFET College Of Engineering; Ms. R.AKTHARUNISA BEGUM, IFET College Of Engineering; Mr.S.SIVACHANDIRAN, IFET College Of Engineering

Keywords:

Shared Data, ECC Algorithm, Public Auditing, Re-signature, Symmetric Encryption

Abstract:

With data storage and sharing services in the cloud, users can easily modify and share data as a group. To ensure shared data integrity can be verified publicly, users in the group need to compute signatures on all the blocks in shared data. Different blocks in shared data are generally signed by different users due to data modifications performed by different users. For security reasons, once a user is revoked from the group, the blocks which were previously signed by this revoked user must be re-signed by an existing user. The straightforward method, which allows an existing user to download the corresponding part of shared data and re-sign it during user revocation, is inefficient due to the large size of shared data in the cloud. In this paper, we propose a novel public auditing mechanism for the integrity of shared data with efficient user revocation in mind. By utilizing the idea of proxy re-signatures, we allow the cloud to re-sign blocks on behalf of existing users during user revocation, so that existing users do not need to download and re-sign blocks by themselves. In addition, by leveraging group signature and dynamic broadcast encryption techniques and for overall security Elliptic curve cryptography(ECC) algorithm is used, so that any cloud user can anonymously share data with others. The storage overhead and encryption computation cost of the scheme are independent with the number of revoked users.

Other Details:

Manuscript Id	:	IJSTEV1I10108
Published in	:	Volume : 1, Issue : 10
Publication Date	:	01/05/2015
Page(s)	:	263-268

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