Cryptology ePrint Archive: Report 2005/238
Simple and Provable Secure Strong Designated Verifier Signature Schemes
Raylin Tso and Takeshi Okamoto and Eiji Okamoto
Abstract: In this paper, we introduce
a simple strong-designated verifier signature (SDVS) scheme which is much more efficient than
previously proposed SDVS schemes. In addition, with only one more parameter
published by the signer, this scheme can provide signer's forward security. That is,
the consistency of a signature cannot
be verified by any third party even if he/she knows a signer's private key.
Thus the privacy of a signer's identity
is protected independently in each signature,
if the designated verifier's private key has
not been disclosed.
In addition, this scheme can be easily modified to a designated verifier signcryption scheme with
virtually no additional cost. We will also show that the proposed scheme is provably secure in the random oracle model.
Category / Keywords: cryptographic protocols / signature, anonymity.
Date: received 21 Jul 2005, withdrawn 24 Sep 2005
Contact author: raylin at cipher risk tsukuba ac jp
Available format(s): (-- withdrawn --)
Version: 20050925:025036 (All versions of this report)
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