Cryptology ePrint Archive: Report 2003/167

Identity-based Chameleon Hash and Applications

Giuseppe Ateniese and Breno de Medeiros

Abstract: Chameleon signatures are non-interactive signatures based on a hash-and-sign para\-digm, and similar in efficiency to regular signatures. The distinguishing characteristic of chameleon signatures is that their are non-transferable, with only the designated recipient capable of asserting its validity. In this paper, we introduce the first identity-based chameleon hash function. The general advantages of identity-based cryptography over conventional schemes relative to key distribution are even more pronounced in a chameleon hashing scheme, because the owner of a public key does not necessarily need to retrieve the associated secret key. We use the identity-based chameleon hashing scheme to build the id-based chameleon signature and a novel sealed-bid auction scheme that is robust, communication efficient (bidders send a single message), and secure under a particular trust model.

Category / Keywords: Digital signatures, secure hash functions, chameleon hashing, sealed-bid auctions.

Publication Info: In Financial Cryptography 2004 (FC'04)

Date: received 11 Aug 2003, last revised 15 Mar 2004

Contact author: ateniese at cs jhu edu

Available format(s): PDF | BibTeX Citation

Note: Incorporated FC'04 anonymous referees' comments.

Version: 20040315:231840 (All versions of this report)

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