Group signature schemes with forward secure properties

摘要

A group signature scheme allows a group member to sign messages anonymously on behalf of the group. However, in the case of a dispute, the identity of a signature can be revealed by a designated entity. We introduce a forward secure schemes into group signature schemes. When the group public key remains fixed, a group signing key evolves over time. Because the signing key of a group member is evolving at time, the possibility of the signing key being exposed is decreased. We propose a forward secure group signature scheme based on Ateniese and Camenisch et al.’s group signature scheme. The security is analyzed and the comparisons between our scheme with other group signature schemes are made.