Cryptology ePrint Archive: Report 2006/325

Invisible Designated Confirmer Signatures without Random Oracles

Victor K. Wei

Abstract: We construct the first $O(1)$-size designated confirmer signatures (DCS) with security in the state-of-the-art model of Camenisch and Michels, Eurocrypt 2000, without random oracles. In particular, we achieve the security notion called the "invisibility of signature" therein.

Category / Keywords: designated confirmer signature, undeniable signature

Date: received 26 Sep 2006, last revised 11 Oct 2006

Contact author: kwwei at ie cuhk edu hk

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Version: 20061011:104700 (All versions of this report)

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