Flaw and Improvement of Three Certificateless Signature Schemes
Shunxiang Wu · Jisuanji gongcheng · 2009
The security flaws of two provably-secure certificateless signature schemes in the random oracle model and a provably-secure certificateless signature scheme in the standard model are analyzed.It is found that the three schemes are all insecure against public key replacement attack.In this attack,an adversary can generate a new public key satisfying legitimate signatures created by the legitimate signer.In order to avoid these flaws,an improvement measure is proposed,which can resolve the security problems existing in the original schemes.