Description

Abstract

In this Paper 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, due to the

frequent change of the membership. In this paper, we propose a secure multi owner data sharing

scheme, 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. The proposed scheme enables the authorized users to ensure that they are

receiving the most recent version of the outsourced data. Moreover, in case of dispute regarding

data integrity/newness, a TTP is able to determine the dishonest party.