Secure Data Deduplication with Ownership Management and Sharing in Cloud Storage

Recently, some researchers adopt key-encrypting key (KEK) tree to realize efficient ownership management in deduplication scheme. However, none of the existing schemes realize the data sharing based on KEK tree. In this paper, we propose a randomized client-side deduplication scheme that alleviates duplicate-faking attack and uses randomized file tags to resist the offline brute-force attack launched by outside adversary. Besides, we propose a novel data sharing technique based on KEK tree. Security and efficiency analyses show that our scheme achieves the desired security requirements while saving system resource efficiently.