Group signature with Weil and Tate parings

摘要

We have proposed a group signature scheme based on the Weil or Tate pairing over elliptic curves at SCIS2002. However In the scheme, the group master can forge any signature. In this paper we propose the group signature schemes in which the group master cannot generate any forged signature of the group member. We then propose another group signature scheme which is more secure and simple.