Research On Anonymous And Traceable Group Data Sharing Scheme In Cloud

Group data sharing in cloud environments has become a hot topic in recent decades.With the popularity of cloud computing,how to achieve secure and efficient data sharing in cloud environments is an urgent problem to be solved.In addition,how to achieve both anonymity and traceability is also a challenge in the cloud for data sharing.This paper focuses on enabling data sharing and storage for the same group in the cloud with high security and efficiency in an anonymous manner.First,a common conference key is derived based on the key agreement to enable group members to share and store their data securely.Note that a symmetric balanced incomplete block design(SBIBD)is utilized for key generation.The symmetric and balanced properties of the SBIBD are analyzed,which can be applied in key agreement protocol to substantially reduce the burden on members to derive a common conference key.Then,the SBIBD construtions are proposed,which can be achieved by algorithm,linear feedback shif register(LFSR)and state transition matrix,respectively.The secure and efficient group data shaing in cloud is supported based on the proposed SBIBD-based key agreement propocol.By leveraging the SBIBD-based key agreement protocol and the group signature,a novel traceable group data sharing scheme is proposed to support anonymous multiple users in public clouds.In the proposed scheme,group members can communicate anonymously with respect to the group signature,and the real identities of members can be traced if necessary.Both theoretical and experimental analyses demonstrate that the proposed scheme is secure and efficient for group data sharing in cloud computing.