ISSN: 2319-7293
T.Vijayalakshmi, Balika J Chelliah & R. Jegadeesan
Cloud computing has a character of low manintance which will provide an effective solution to share resource among group of users in the cloud. Major problem in public cloud is how to share data’s and documents based on fine grained access control policies, due to frequent change of the membership data sharing in dynamic groups to preserve data and identity privacy from a cloud which is a untrusted one is still a challenging issue. Encrypting the Document with different key such as Attribute Based Encryption and Proxy Re-Encryption have many draw backs .These approaches is efficient to handle user registration and revocation. It requires maintaining many encrypted copies of the single document, which incurs high computational costs. In this paper we propose a privacy preserved multi owner data sharing scheme, named Suody.By taking maximum advantage of group signature to construct homomorphic authenticators, signed receipts and dynamic broadcast encryption techniques, a user in the cloud can share the data with others using withheld authorship. At the same time overhead in the storage and computation cost for encryption of our scheme for the number of users revoked are independent .Additionally, we also analyze schemes security with rigorous proofs