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Title:
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FAIR BLIND SIGNATURE WITH OBSERVER |
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Author(s):
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Zhi-kai Zhang , D. J. Guan , Chun-i Fan |
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ISBN:
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972-98947-3-6 |
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Editors:
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Nuno Guimarães and Pedro Isaías |
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Year:
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2004 |
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Edition:
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Single |
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Keywords:
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Digital signatures, Blind signatures, Electronic cash, Electronic commerce, Cryptology . |
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Type:
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Short Paper |
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First Page:
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2168 |
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Last Page:
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2171 |
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Language:
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English |
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Cover:
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Full Contents:
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click to dowload 
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Paper Abstract:
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Fair blind signatures have been widely adopted to construct untraceable electronic cash systems for dealing with the misuse of the cash. In a fair blind signature scheme, a judge can retrieve the link information in the blind signatures when the electronic cash is misused. In the design of a fair blind signature, an on-line judge must involve in every signature. Although it can provide higher security than an off-line judge, it is inefficient and is impractical to implement. In this paper, we propose a fair blind signature scheme with tamper-resistant devices, called observers. The observer can reduce the workload of the on-line judge without compromising the security of the scheme. Moreover, our scheme provides both signature-tracing and owner-tracing mechanisms, and the tracing mechanisms satisfy the nonrepudiation property. That is, the judge in our scheme can prove when and by whom the blind signature was requested. Our scheme can also withstand the chosen-message attacks since the sender cannot fully control the contents of the message-signature pair. |
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