Cryptology ePrint Archive: Report 2008/254

An Efficient Identity-based Ring Signcryption Scheme

Zhenchao ZHU and Yuqing ZHANG and FengjiaoWANG

Abstract: ID-based ring signcryption schemes (IDRSC) are usually derived from bilinear parings, a powerful but computationally expensive primitive. The number of paring computations of all existing ID-based ring signcryption schemes from bilinear pairings grows linearly with the group size, which makes the efficiency of ID-based schemes over traditional schemes questionable. In this paper, we present a new identity-based ring signcryption scheme, which only takes four pairing operations for any group size and the scheme is proven to be indistinguishable against adaptive chosen ciphertext ring attacks (IND-IDRSC-CCA2) and secure against an existential forgery for adaptive chosen messages attacks (EF-IDRSC-ACMA).

Category / Keywords: cryptographic protocols / Identity-based cryptography, ring signcryption, bilinear pairing

Date: received 3 Jun 2008

Contact author: chao0121 at 126 com

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Version: 20080605:123641 (All versions of this report)

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