An automatic access control based on an improved CP-ABE algorithm in wireless sensor networks

Existing security management methods in wireless sensor networks typically employ asymmetric key encryption algorithms for automatic access control, resulting in high time overhead. In wireless sensor networks, different nodes may have different roles. Ciphertext-policy attribute-based encryption (CP-ABE) can dynamically adapt to diverse privilege requirements without assigning separate keys to each user. Therefore, an enhanced access control method is proposed based on an improved CP-ABE algorithm. First, we proposed a distributed CP-ABE algorithm supporting efficient revocable and outsourced computation. Second, based on the historical interaction records, the dynamic user identity trust degree is calculated and added to the access structure. The security analysis and simulation results indicate that the proposed method not only satisfies the indistinguishability under selective plaintext attack but also meets the real-time requirement, with the average time overhead of access control reaching only 42.5 ms when the number of concurrent access users is 100.