Committal deniable signatures over elliptic curves

In this paper, a new deniable signature scheme, i.e. the committal deniable signature scheme is proposed. This scheme has been constructed by use of bilinear pairings over elliptic curves. In addition to the general property possessed by other deniable signature schemes, there are some new features for this new scheme. One important of them is that signer is not able to forge this type of deniable signatures on behalf of the verifier or any third party. Another feature is that any third party, even though she can obtain the committal deniable signatures by tapping, cannot distinguish the actual signer between the verifier and the signer in the underlying system.