Forgeability attack of two DLP-base proxy blind signature schemes

Authors:
Jianhong Zhang;Fenhong Guo;Zhibin Sun;Jilin Wang
Affiliations:
College of Sciences, North China University of Technology, Beijing, P.R.China;College of Sciences, North China University of Technology, Beijing, P.R.China;College of Sciences, North China University of Technology, Beijing, P.R.China;College of Infomation, Zhejiang University of Finance and Economics, Hangzhou, China
Venue:
ICSI'11 Proceedings of the Second international conference on Advances in swarm intelligence - Volume Part II
Year:
2011

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Abstract

Proxy blind signature is a cryptographical technique and allows a proxy signer to produce a proxy blind signature on behalf of original signer, in such a way that the authority learns nothing about the message that is being signed. The unforgeability is an important property of digital signature. In this work, we analyze security of two DLP-based proxy blind signature schemes, and show that the two schemes are insecure. They are universally forgeable, in other words, anyone is able to forge a proxy blind signature on arbitrary a message. And we also analyze the reason to produce such attack. Finally, the corresponding attack is given.