International Association for Cryptologic Research

International Association
for Cryptologic Research


Paper: A New Forward-Secure Digital Signature Scheme

Michel Abdalla
Leonid Reyzin
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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.
  title={A New Forward-Secure Digital Signature Scheme},
  booktitle={IACR Eprint archive},
  keywords={foundations / forward security, digital signatures, proven security, concrete security},
  note={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. 11214 received 6 Mar 2000, revised 14 Sep 2000},
  author={Michel Abdalla and Leonid Reyzin},