Cryptanalysis of Two Certificateless Signature Schemes
WU Chen-huan · Shuxue de shijian yu renshi · 2015
A certificateless aggregate signature shcheme recently proposed by HOU Hongxia et al.is cryptanalyzed,which is published on Journal of Shandong University(Natural Science).There are two kinds of attacks in their scheme.In these two attacks,KGC have the same ability as the signer,who can generate a valid signature on any selected message.Moreover,an efficient certificateless sequential multi-signature scheme is cryptanalyzed,which is published on Journal on Communications.As a result,anyone can carry out the attack on this scheme.Finally,the main reason of the existence of these attacks is provided.Furthermore,the attack methods in this paper have valuable reference to the construction and security analysis of certificateless signature schemes.