Comment on "A Convertible Limited Verifier Signature Scheme"
Zuhua Shao · Journal of Zhejiang University of Science and Technology · 2006
In WAIM2005,J.Zhang et al.proposed a convertible limited verifier signature scheme.They said that the security of this scheme is based on the CDH assumption and the difficulty of solving inverse of hash function.Furthermore,they claimed that To the best of my knowledge,it seems to be the first provably secure convertible limited verifier signature scheme without using random oracle model.However,in this comment,we find that it is indeed just in opposition,since their proofs are established on several fatal logic errors.