Efficient User Revocation and Multiowner Datasharing Scheme for Cloud Based Dynamic Groups

Cloud computing provides an economical and efficient solution for sharing group resource among cloud users. Unfortunately, sharing data in a multi‐owner manner while preserving data and identity privacy from an untrusted cloud is still a challenging issue. In this paper, we propose a secure multi‐ owner data sharing scheme, named Mona, for dynamic groups in the cloud. By leveraging group signature and dynamic broadcast encryption techniques, any cloud user can anonymously share data with others. Meanwhile, the storage overhead and encryption computation cost of our scheme are independent with the number of revoked users.Groupsignature will provide security to cloud users.We are providing blocked list,, revoked list to the cloud. In addition, we analyze the security of our scheme with rigorous proofs, and demonstrate the efficiency of our scheme in experiments. KEYWORDS‐ Cloud computing, data sharing, privacy‐preserving, access control, Group Signature, dynamic groups.