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The digital equivalent of a handwritten signature or stamped seal, but offering far more inherent security, a digital signature is intended to solve the problem of tampering and impersonation in digital communications. Digital signatures can provide the added assurances of evidence to origin, identity and status of an electronic document, transaction or message, as well as acknowledging informed consent...
W.-B. Lee and C.-C. Chang (1998) proposed a very efficient group signature scheme based on the discrete logarithm problem. This scheme was subsequently improved by Y.-M. Tseng and J.-K. Jan (1999) so that the resulting group signatures are unlinkable. In this paper, we show that any obvious attempt to make unlinkable the Lee-Chang signatures would likely fail. More importantly, we show that both the...
As the Internet becomes omnipresent, people nowadays depend heavily on the on-line services for their shopping and banking transactions. However, users register for on-line services may not like their activities being logged and analyzed by the service providers. Anonymity is essential in the protection of users' privacy, especially now when the Internet is a treacherous place full of embezzlers trying...
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