Improved signature schemes with specified receiver
Qixiang Mei · Journal of China Institute of Communications · 2005
Two new signature schemes with specified receiver were proposed in this paper. In both the schemes , forging signatures by the inside attacker is provably equivalent to forging Schnorr signature, and verifying the validity of the signature by the outside attacker is equivalent to breaking the Diffie-Hellman problem. The compu- tational complexity of the new schemes is smaller than those proposed by Cao-Li-Li and zhang-Cai-Xiao. Comparing to the sch- eme proposed by Cao-Li-Li, our first scheme inherent its advantage that enjoying both the authentication and secr- ecy, and overcomes its disadvantage that using checksum to verify validity of the signature. Based the proposed schemes, we construct two novel efficient threshold shared verification signature schemes.