Cryptology ePrint Archive: Report 2008/305

Identity-Based Directed Signature Scheme from Bilinear Pairings

Xun Sun and Jian-hua Li and Gong-liang Chen and Shu-tang Yang

Abstract: In a directed signature scheme, a verifier can exclusively verify the signatures designated to himself, and shares with the signer the ability to prove correctness of the signature to a third party when necessary. Directed signature schemes are suitable for applications such as bill of tax and bill of health.

This paper studies directed signatures in the identity-based setting. We first present the syntax and security notion that includes unforgeability and invisibility, then propose a concrete identity-based directed signature scheme from bilinear pairings. We then prove our scheme existentially unforgeable under the computational Diffie-Hellman assumption, and invisible under the decisional Bilinear Diffie-Hellman assumption, both in the random oracle model.

Category / Keywords: applications / Bilinear pairings; Directed signature; Existential unforgeability; Identity-based cryptography; Invisibility

Date: received 7 Jul 2008

Contact author: xun sun cn at gmail com

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Version: 20080708:165513 (All versions of this report)

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