A New Group Signature Scheme using IBE

Group signature is a method which allows any genuine group member to sign many number of messages on behalf of the group without giving his identity. Whenever dispute arises, the manager of the group can reveal the identity of the signer. If quantum computer comes in to picture group signatures which are based on the traditional cryptography can be broken easily. In this paper, we propose a new identity based group signature. Our signature scheme is based on bilinear maps. This identity based scheme has the security properties of group signatures. In this scheme the size of the group pubic key and the length of signatures are independent on the size of the group. This scheme can be used for very large groups. Same key pair can be used by the group member to sign many messages.