Cryptology ePrint Archive: Report 2009/455

Identity-Based Hybrid Signcryption

Fagen Li and Masaaki Shirase and Tsuyoshi Takagi

Abstract: Signcryption is a cryptographic primitive that fulfills both the functions of digital signature and public key encryption simultaneously, at a cost significantly lower than that required by the traditional signature-then-encryption approach. In this paper, we address a question whether it is possible to construct a hybrid signcryption scheme in identity-based setting. This question seems to have never been addressed in the literature. We answer the question positively in this paper. In particular, we extend the concept of signcryption key encapsulation mechanism to the identity-based setting. We show that an identity-based signcryption scheme can be constructed by combining an identity-based signcryption key encapsulation mechanism with a data encapsulation mechanism. We also give an example of identity-based signcryption key encapsulation mechanism.

Category / Keywords: public-key cryptography /

Publication Info: This is the full version of a paper published in ARES 2009

Date: received 16 Sep 2009

Contact author: fagenli at uestc edu cn

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Version: 20090920:045111 (All versions of this report)

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