Cryptology ePrint Archive: Report 2000/002

A New Forward-Secure Digital Signature Scheme

Michel Abdalla and Leonid Reyzin

Abstract: We improve the Bellare-Miner (Crypto '99) construction of signature schemes with forward security in the random oracle model. Our scheme has significantly shorter keys and is, therefore, more practical. By using a direct proof technique not used for forward-secure schemes before, we are able to provide better security bounds for the original construction as well as for our scheme.

Bellare and Miner also presented a method for constructing such schemes without the use of the random oracle. We conclude by proposing an improvement to their method and an additional, new method for accomplishing this.

Category / Keywords: foundations / forward security, digital signatures, proven security, concrete security

Publication Info: The extended abstract of this work appears in Advances in Cryptology --- Asiacrypt 2000, Tatsuaki Okamoto, editor, Lecture Notes in Computer Science, Springer-Verlag, 2000, IACR.

Date: received 6 Mar 2000, revised 14 Sep 2000

Contact author: mabdalla at cs ucsd edu

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Version: 20000914:074729 (All versions of this report)

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