International Association for Cryptologic Research

International Association
for Cryptologic Research


Paper: Revisiting fully distributed proxy signature schemes

Javier Herranz
German Saez
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Abstract: In a proxy signature scheme, a potential signer delegates his capabilities to a proxy signer, who can sign documents on behalf of him. The recipient of the signature verifies both identities: that of the delegator and that of the proxy signer. There are many proposals of proxy signature schemes, but security of them has not been considered in a formal way until the appearance of the work by Boldyreva et al. If the entities which take part in a proxy signature scheme are formed by sets of participants, then we refer to it as a fully distributed proxy signature scheme. In this work, we extend the security definitions introduced by Boldyreva et al. to the scenario of fully distributed proxy signature schemes, and we propose a specific scheme which is secure in this new model.
  title={Revisiting fully distributed proxy signature schemes},
  booktitle={IACR Eprint archive},
  keywords={public-key cryptography / proxy signatures, distributed cryptography, security proofs},
  note={ 12319 received 24 Sep 2003},
  author={Javier Herranz and German Saez},