Title: The power of identification schemes

Authors: Kaoru Kurosawa, Swee-Huay Heng

Addresses: Department of Computer and Information Sciences, Ibaraki University, 4-12-1 Nakanarusawa, Hitachi, Ibaraki 316-8511, Japan. ' Multimedia University, Jalan Ayer Keroh Lama, Melaka 75450, Malaysia

Abstract: In this paper, we show that Identification schemes (ID-schemes) are very powerful in some areas of cryptography. We first prove an equivalence between non-interactive trapdoor commitment schemes and a natural class of ID-schemes. We next propose a more efficient online/off-line signature transformation than Shamir-Tauman. As an application, we present a variant of the Boneh-Boyen (BB) signature scheme which is not only online/off-line but also has a smaller public key size than the original BB scheme. Finally, we present the first Identity-based ID-scheme which is secure against concurrent man-in-the-middle attack without random oracles by using our variant of BB signature scheme.

Keywords: identification schemes; ID schemes; signature schemes; trapdoor commitment schemes; online-off-line signature transformation; identity-based cryptography; applied cryptography; public key size; security; Boneh-Boyen signature scheme.

DOI: 10.1504/IJACT.2008.017050

International Journal of Applied Cryptography, 2008 Vol.1 No.1, pp.60 - 69

Available online: 06 Feb 2008 *

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