Welcome to the resource topic for 2003/243
Title:
An Attack on Not-interactive Designated Verifier Proofs for Undeniable Signatures
Authors: Guilin Wang
Abstract:At Crypto’89, Chaum and van Antwerpen first introduced the concept of undeniable signatures, which has a special property such that a signature cannot be verified without the signer’s cooperation. In 1996, Jakobsson, Sako, and Impagliazzo proposed a not-interactive undeniable signature scheme by employing a new primitive called designated verifier proofs. However, this paper shows that their scheme is insecure by demonstrating a simple attack that allows a dishonest signer to convince a designated verifier receiving invalid signatures. In addition, two intuitive countermeasures are presented.
ePrint: https://eprint.iacr.org/2003/243
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