关键词: 关键词: 云计算, 动态更新, CP-ABE算法, Merkle Hash Tree, 云安全

Abstract: Abstract: This paper investigates the security protection and data dynamic updating problems in cloud computing. It proposes a dynamic updating ciphertext-policy attribute-based encryption (DU-CPABE) scheme which enables both data dynamic updating and security protection. The DU-CPABE scheme linearly splits the data into blocks with a fixed size, and applies ciphertext-policy attribute-based encryption (CP-ABE) algorithm for data protection. Furthermore, based on conventional Merkle hash tree (MHT), an address MHT (A-MHT) is proposed for the operation of dynamically updating data in cloud computing. Based on theoretical analyses and simulation results, our proposed scheme outperforms conventional CP-ABE method in terms of performance and time overhead in cloud computing environment.

Key words: cloud computing, data dynamic updating, CP-ABE algorithm, Merkle Hash Tree, cloud security