Cryptology ePrint Archive: Report 2004/093

A Provably Secure Nyberg-Rueppel Signature Variant with Applications

Giuseppe Ateniese and Breno de Medeiros

Abstract: This paper analyzes the modified Nyberg-Rueppel signature scheme (mNR), proving it secure in the Generic Group Model (GM). We also show that the security of the mNR signature is equivalent (in the standard model) to that of a twin signature, while achieving computational and bandwidth improvements.

As a provably secure signature scheme, mNR is very efficient. We demonstrate its practical relevance by providing an application to the construction of a provably secure, self-certified, identity-based scheme (SCID). SCID schemes combine some of the best features of both PKI-based schemes (functionally trusted authorities, public keys revocable without the need to change identifier strings) and ID-based ones (lower bandwidth requirements). The new SCID scheme matches the performance achieved by the most efficient ones based on the discrete logarithm, while requiring only standard security assumptions in the Generic Group Model.

Category / Keywords: Generic Group Model, signature schemes, Nyberg-Rueppel variants, self-certified identity-based cryptography

Publication Info: manuscript

Date: received 16 Apr 2004, last revised 7 May 2004

Contact author: breno at cs jhu edu

Available format(s): Postscript (PS) | Compressed Postscript (PS.GZ) | PDF | BibTeX Citation

Note: This revision adds applications to self-certified public key schemes.

Version: 20040507:213005 (All versions of this report)

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