Cryptology ePrint Archive: Report 2009/307
Anonymous Signatures Revisited
Vishal Saraswat and Aaram Yun
Abstract: We revisit the notion of the anonymous signature, first formalized by
Yang, Wong, Deng and Wang, and then further developed by
Fischlin, and Zhang and Imai.
We present a new formalism of anonymous signature, where instead of the message,
a part of the signature is withheld to maintain anonymity.
We introduce the notion unpretendability
to guarantee infeasibility for someone other than the correct signer to
pretend authorship of the message and signature. Our definition retains
applicability for all previous applications of the anonymous signature,
provides stronger security, and is conceptually simpler.
We give a generic construction from any ordinary signature scheme, and also
show that the short signature scheme by Boneh and Boyen can be naturally
regarded as such a secure anonymous signature scheme according to
Category / Keywords: public-key cryptography / anonymous signature, signature, anonymity, unpretendability
Publication Info: A previous version is to be published in ProvSec 2009
Date: received 25 Jun 2009, last revised 12 Oct 2009
Contact author: aaramyun at gmail com
Available formats: PDF | BibTeX Citation
Note: We revised security definitions and modified the result about Boneh-Boyen accordingly. Also we reformulated our constructions in terms of commitment schemes.
Version: 20091012:171027 (All versions of this report)
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