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Security Flaws in Several Group Signatures Proposed by Popescu. Cryptology ePrint archive, report 2003/207 (2003)

by Guilin Wang, Sihan Qing
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Untraceability of Wang-Fu Group Signature Scheme

by Zhengjun Cao, Lihua Liu
"... Abstract Wang et al. recently proposed an improved edition based on Tseng-Jan group signature scheme [1]. In the paper, we show that the scheme is untraceable by a simple attack. ..."
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Abstract Wang et al. recently proposed an improved edition based on Tseng-Jan group signature scheme [1]. In the paper, we show that the scheme is untraceable by a simple attack.
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...s. Hence, Tseng and Jan proposed two improved group signature schemes based on Lee-Chang scheme. Regrettably, their schemes are all insecure, too. Z.C.Li et al. have presented several attacks on them =-=[7,8,9,10,11,12,13]-=- . Incidentally, We have given a new and simple attack in a script. Recently, Wang and Fu proposed a new edition based on Tseng-Jan scheme. In this paper, we show that the new edition is also insecure...

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