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Anonymity and Denial of Undeniable and Confirmer Signatures

Galbraith, Steven D.; Mao, Wenbo


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Abstract: We introduce a new security property for undeniable and confirmer signatures in the multi-user setting, namely, anonymity. We show that many existing systems do not have this property. We modify the original undeniable signature scheme of Chaum and van Antwerpen and the RSA-based undeniable / confirmer signature scheme of Gennaro, Krawczyk and Rabin so that they achieve anonymity. We also provide a new, more efficient, denial protocol for the undeniable signature scheme of Chaum and van Antwerpen. Notes: Steven D. Galbraith, Mathematics Department, Royal Holloway University of London, Egham, Surrey TW20 0EX, UK

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