International Association for Cryptologic Research

International Association
for Cryptologic Research


Paper: A forward-secure digital signature scheme

Mihir Bellare
Sara Miner
Search ePrint
Search Google
Abstract: We describe a digital signature scheme in which the public key is fixed but the secret signing key is updated at regular intervals so as to provide a <i>forward security</i> property: compromise of the current secret key does not enable an adversary to forge signatures pertaining to the past. This can be useful to mitigate the damage caused by key exposure without requiring distribution of keys. Our construction uses ideas from the Fiat-Shamir and Ong-Schnorr identification and signature schemes, and is proven to be forward secure based on the hardness of factoring, in the random oracle model. The construction is also quite efficient.
  title={A forward-secure digital signature scheme},
  booktitle={IACR Eprint archive},
  keywords={Digital signatures, forward security, identification, factoring.},
  note={Appeared in the THEORY OF CRYPTOGRAPHY LIBRARY and has been included in the ePrint Archive. 10500 received July 13th, 1999.},
  author={Mihir Bellare and Sara Miner},