A new construction of identity-based group signature

Abstract

Identity-based (simply ID-based) public key cryptosystem allows the user to use his identity as the public key, which can be a good alternative for certificate-based public key setting. Group signature allows any member of a group to sign on behalf of the group without revealing his identity. A complete ID-based group signature scheme was proposed in ACISP’06. However, it was very impractical. In this paper, we give a construction of identity-based group signatures. Then, we construct an efficient ID-based group signature scheme. We also show that the group signature scheme is provably secure in the random oracle model.