An access control scheme with dynamic user management and cloud-aided decryption

作者：Shi, Jiaoli; Huang, Chuanhe^*; Wang, Jing; He, Kai; Shen, Xieyang

来源：Security and Communication Networks, 2016, 9(18): 5659-5672.

DOI：10.1002/sec.1725

• cloud storage system
• access control
• ciphertext-policy attribute-based encryption
• dynamic user management
• cloud-aided decryption

Ciphertext-policy attribute-based encryption is becoming a cryptographic solution to realize fine-grained access control. However, some important problems have not been effectively solved yet such as (i) low efficiency of dynamic change of a user or his attribute and (ii) high computation cost at user end. In this paper, we propose an access control scheme with dynamic user management using a version key and especially realize direct cloud-aided attribute revocation without updating another user's key or re-encrypting ciphertexts. We present a cloud-aided decryption method with which most of decrypting work can be transferred to cloud. Compared with the existing schemes, our scheme causes less computation cost at user end and supports efficient dynamic change of a user or his attribute. Simulation indicates that our direct cloud-aided attribute revocation method takes less time.

• 出版日期2016-12
• 单位九江学院; 武汉大学