Attack for Wu-Wang blind signature scheme and its improvement
Jianzhong Zhang · Computer Engineering and Applications Journal · 2012
The security of blind signature scheme based on the discrete logarithm problem which is proposed by Wu-Wang is analyzed,and a security attack is given,that is,a signature requester can obtain valid signatures of two different messages at the same time through performing only one round of the protocol. A modified scheme is presented,in the signature phrase a random number is used by a signer to prevent this kind of attack,and its security is improved.