Secure mediated certificateless signature scheme  

作　　者：YANG Chen MA Wen-ping WANG Xin-mei 

机构地区：[1]Ministry of Education Key Laboratory of Computer Networks and Information Security, Xidian University, Xi'an 710071, China

出　　处：《The Journal of China Universities of Posts and Telecommunications》2007年第2期75-78,共4页中国邮电高校学报（英文版）

基　　金：Program for New Century Excellent Talents in University and the National Natural Science Foundation of China （60373104, 90604009）.

摘　　要：Ju et al. proposed a certificateless signature scheme with instantaneous revocation by introducing security mediator （SEM） mechanism. This article presents a detailed cryptoanalysis of this scheme and shows that, in their proposed scheme, once a valid signature has been produced, the signer can recover his private key information and the instantaneous revocation property will be damaged. Furthermore, an improved mediated signature scheme, which can eliminate these disadvantages, is proposed, and security proof of the improved scheme under elliptic curve factorization problem （ECFP） assumption and bilinear computational diffie-hellman problem （BCDH） assumption is also proposed.Ju et al. proposed a certificateless signature scheme with instantaneous revocation by introducing security mediator （SEM） mechanism. This article presents a detailed cryptoanalysis of this scheme and shows that, in their proposed scheme, once a valid signature has been produced, the signer can recover his private key information and the instantaneous revocation property will be damaged. Furthermore, an improved mediated signature scheme, which can eliminate these disadvantages, is proposed, and security proof of the improved scheme under elliptic curve factorization problem （ECFP） assumption and bilinear computational diffie-hellman problem （BCDH） assumption is also proposed.

关 键 词：CERTIFICATELESS signature scheme bilinear pairing security mediator 

分 类 号：TN918[电子电信—通信与信息系统]