Fair blind threshold signatures in wallet with observers

Authors:
Wen-Shenq Juang;Horng-Twu Liaw
Affiliations:
Department of Information Management, Shih Hsin University, No. 1, Lane 17, Sec. 1, Muja Rd., Wenshan Chiu, Taipei 116, Taiwan, ROC;Department of Information Management, Shih Hsin University, No. 1, Lane 17, Sec. 1, Muja Rd., Wenshan Chiu, Taipei 116, Taiwan, ROC
Venue:
Journal of Systems and Software
Year:
2004

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Abstract

In this paper, we propose efficient fair blind (t,n) threshold signature schemes in wallet with observers. By these schemes, any t out of n signers in a group can represent the group to sign fair blind threshold signatures, which can be used in anonymous e-cash systems. Since blind signature schemes provide perfect unlinkability, such e-cash systems can be misused by criminals, e.g. to safely obtain a ransom or to launder money. Our schemes allow the judge (or the judges) to deliver information allowing anyone of the t signers to link his view of the protocol and the message signature pair.