Cryptology ePrint Archive: Report 2006/080

Efficient Identity-based Signatures Secure in the Standard Model

Kenneth G. Paterson and Jacob C. N. Schuldt

Abstract: The only known construction of identity-based signatures that can be proven secure in the standard model is based on the approach of attaching certificates to non-identity-based signatures. This folklore construction method leads to schemes that are somewhat inefficient and leaves open the problem of finding more efficient direct constructions. We present the first such construction. Our scheme is obtained from a modification of Waters' recently proposed identity-based encryption scheme. It is computationally efficient and the signatures are short. The scheme's security is proven in the standard model and rests on the hardness of the computational Diffie-Hellman problem in groups equipped with a pairing.

Category / Keywords: public-key cryptography / Identity-based signatures; standard model

Date: received 28 Feb 2006, last revised 20 Apr 2006

Contact author: jacob schuldt at rhul ac uk

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Version: 20060420:130828 (All versions of this report)

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