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Erschienen in:
2006 | OriginalPaper | Buchkapitel
Stand-Alone and Setup-Free Verifiably Committed Signatures
verfasst von : Huafei Zhu, Feng Bao
Erschienen in: Topics in Cryptology – CT-RSA 2006
Verlag: Springer Berlin Heidelberg
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In this paper, a novel construction of stand-alone and setup-free verifiably committed signatures from RSA – an open problem advertised by Dodis and Reyzin in their speech [16] is presented. The methodology used in this paper is reminiscent of the concept of verifiably encrypted signatures introduced by Asokan et al [1, 2] . We suggest to encrypt only a random salt used to generate a virtual commitment that will be embedded into Cramer-Shoup’s signature scheme and to prove the validity of the signature with respect to this encrypted value. Our construction is provably secure assuming that the underlying Cramer-Shoup’s signature scheme is secure against adaptive chosen-message attack, and Paillier’s encryption is one-way. We thus provide an efficient solution to Dodis-Reyzin’s open problem.