Analysis and Improvement of Certificateless Signature Scheme
Song Chun-guang · Jisuanji gongcheng · 2012
This paper analyzes a certificateless signature scheme based on discrete logarithm problem,which is proposed by Zhang Yanyan et al and points out that their scheme is universally forgeable,and an adversary can forge any signer's valid signature on any message by replacing public key.It also presents an improved scheme which is proved to be existentially unforgeable in a super security model.In addition,the improved scheme has the advantage of high computation efficiency,as there is no heavily cost bilinear pairing operation in the improved scheme.