The secure data sharing across data domains in cloud-edge collaborative environment faces challenges of low data access control efficiency and a lack of dynamism. In this work, we proposed FPCA, a fully constant-length and policy updating cross data domain access control for cloud-edge collaborative environment. FPCA address the above challenges by proposing three algorithms: the Multi Data Domains Key Generation (MDKG) algorithm maintains constant secret key length and enables cross data domain access without attribute conversion, the Constant-Length Ciphertext Encryption (CLCE) algorithm maintains constant ciphertext length, reducing decryption overhead, and the Access Policy Update (APU) algorithm updates the access policy with constant-length update message and low computational complexity. Security analysis demonstrates FPCA resist key forgery, collusion, and chosen-key attacks while ensuring backward security. Simulation experiment shows that FPCA outperforms existing schemes. For FPCA, the storage costs are only 50% to 80% of other constant-length ABE schemes, the communication costs remains at 0.38?1.27 KB between entities, the time costs of access policy update and cross data domain access remain around 8.4 ms and 30.4 ms, respectively, and are lower than other similar schemes. These results confirm the efficiency of FPCA in achieving secure and dynamic cross data domain access in cloud-edge collaborative environment.
Zhang et al. (Thu,) studied this question.