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Thokchom, Surmila, Saikia, Dilip Kr..  2018.  Efficient Scheme for Dynamic Cloud Data Shared Within a Static Group with Privacy Preserving Auditing and Traceability. Proceedings of the 2018 International Conference on Cloud Computing and Internet of Things. :25–32.

This paper proposes an efficient auditing scheme for checking the integrity of dynamic data shared among a static group of users outsourced at untrusted cloud storage. The scheme is designed based on CDH-based ring signature scheme. The scheme enables a third party auditor to audit the client's data without knowing the content while also preserving the identity privacy of the group member who is signing the data from the auditor as well as from the cloud server. The identity of the group member who is signing the data block can be revealed only by the authorized opener, if needed. The paper presents a comparative performance study and security analysis of the proposed scheme.