Deduplicatable Dynamic Proof of Storage for Multi-User Environments

Electronics and Communication Engineering

NATIONAL CONFERENCE on VLSI, COMMUNICATION AND SIGNAL PROCESSING (NCVCS-2017)

Dynamic Proof of Storage (PoS) is a useful cryptographic technique that enables a user to check the integrity of outsourced files and to efficiently update the files in a cloud server. Although many dynamic PoS schemes in single user environments were proposed by researchers, the problem in multi-user environments has not been investigated sufficiently. A multi-user cloud storage system requires secure client-side cross-user deduplication technique, which allows a user to skip the uploading process and immediately obtain the ownership of the files, when other owners of the same files have uploaded them to the cloud server. To the best of our knowledge, none of the existing dynamic PoSs can support this technique. In this work, the concept of deduplicatable dynamic proof of storage is introduced and proposed an efficient construction called DeyPoS, to achieve dynamic PoS and secure cross-user deduplication, simultaneously. Considering the challenges of structure diversity and private tag generation, exploited a novel tool called Homomorphic Authenticated Tree (HAT). Aim of this project is to prove the security and efficiency of this construction.

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