Paper 2003/197

Revisiting fully distributed proxy signature schemes

Javier Herranz and German Saez


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.

Available format(s)
Public-key cryptography
Publication info
Published elsewhere. Unknown where it was published
proxy signaturesdistributed cryptographysecurity proofs
Contact author(s)
jherranz @ mat upc es
2003-09-24: received
Short URL
Creative Commons Attribution


      author = {Javier Herranz and German Saez},
      title = {Revisiting fully distributed proxy signature schemes},
      howpublished = {Cryptology ePrint Archive, Paper 2003/197},
      year = {2003},
      note = {\url{}},
      url = {}
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