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In a group signature scheme, a group member signs messages anonymously on behalf of the group. However, in the case of a dispute, the actual group signer's identity can be revealed by a designated entity. In this paper, we propose a new identity-based group signature scheme using bilinear maps. The group signature scheme is well suited for large groups, i. e., the length of the group' s public key...
Recently Cash, Kiltz and Shoup [5] proposed a new computational problem called twin Diffie-Hellman problem. This paper investigates properties of the trapdoor test introduced in [5]. Secondly this paper presents some new relations between the twin Diffie-Hellman problem and the Diffie-Hellman problem.
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