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A Novel Identity-based Group Signature Scheme from Bilinear Maps

We propose an identity-based group signature scheme from bilinear maps. The scheme has the security properties of group signatures. Our scheme is based on the CDHP assumption and bilinear maps between groups. The size of the group pubic key and the length of the signature are independent on the number of group members. Furthermore, a group member can sign many message using the same key pair.