Cryptology ePrint Archive: Report 2002/098

Identity-Based Signcryption

John Malone-Lee

Abstract: A signcryption scheme is a scheme that provides private and authenticated delivery of messages between two parties. It does this in a more efficient manner than a straightforward composition of an encryption scheme with a signature scheme. An identity-based cryptosystem is one in which the public key may be any string (or may be derived from any string).

In this paper we propose an identity-based signcryption scheme. We give a security model for such a scheme and sketch the details of how our scheme may be proved secure in this model.

Category / Keywords: signcryption, identity-based cryptosystem

Date: received 19 Jul 2002

Contact author: malone at cs bris ac uk

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Version: 20020720:235504 (All versions of this report)

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