Abstract:

In order to solve the problem of key leakage in group signature, this paper proposes a group signature scheme with key isolation property by combining key isolation technology with group signature. The scheme uses key isolation method to update secret keys of user and administrator periodically so that key leakage in one time slot will not affect secret keys in other time slots, which improves the security of signature and reduces the loss caused by key leakage. This scheme not only satisfies the security properties of group signature such as anonymity, traceability and unforgeability, but also has some security properties such as key isolation, strong key isolation and security key update. This scheme is more simple and quick to track the group members, and is more convenient to add and delete group members. The scheme greatly improves the efficiency of signature by using bilinear pairings algorithm.

Key words: group signature, key isolation, bilinear pairings