Anonymous Consecutive Delegation of Signing Rights: Unifying Group and Proxy Signatures

Georg Fuchsbauer (1, 2) , David Pointcheval (1, 2)

1 LIENS - Laboratoire d'informatique de l'école normale supérieure
2 CASCADE - Construction and Analysis of Systems for Confidentiality and Authenticity of Data and Entities

We define a general model for consecutive delegations of signing rights with the following properties: The delegatee actually signing and all intermediate delegators remain anonymous. As for group signatures, in case of misuse, a special authority can open signatures to reveal all delegators' and the signer's identity. The scheme satisfies a strong notion of non-frameability generalizing the one for dynamic group signatures. We give formal definitions of security and show them to be satisfiable by constructing an instantiation proven secure under general assumptions in the standard model. Our primitive is a proper generalization of both group signatures and proxy signatures and can be regarded as non-frameable dynamic hierarchical group signatures.

Domaines: Cryptographie et sécurité [cs.CR]

Georg Fuchsbauer, David Pointcheval. Anonymous Consecutive Delegation of Signing Rights: Unifying Group and Proxy Signatures. V. Cortier and C. Kirchner and M. Okada and H. Sakurada. Formal to Practical Security, LNCS 5458, Springer-Verlag, pp.95--116, 2009, Lecture notes in computer science. ⟨inria-00419143⟩