Abstract
The use of group signatures has been widely suggested for authentication with minimum disclosure of information. In this paper, we consider an identity management system, where users can access several group signatures, managed by different authorities. These authorities follow a hierarchy that impacts key issuing and revocation, but we still enforce that anonymity within a group is preserved towards authorities of other groups. We thus define cross-unlinkable hierarchical group signatures, for which we give a generic instantiation based on VLR group signatures and domain-specific pseudonymous signatures.
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Notes
- 1.
- 2.
The \(\mathtt {SendToIssuer}\) oracle might be surprising here. But, contrary to group signatures, the issuing authority IA is not corrupted. This assumption is minimal since the IA may trace all honest users. Hence we must give the adversary the ability to interact as a corrupted user with the honest issuer.
- 3.
Our model takes into account the case where pseudonyms leak from the network. To this aim, the \(\mathtt {NymDomain}\) oracle gives the adversary a collection of pseudonyms.
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Bringer, J., Chabanne, H., Lescuyer, R., Patey, A. (2016). Hierarchical Identities from Group Signatures and Pseudonymous Signatures. In: Ryan, P., Naccache, D., Quisquater, JJ. (eds) The New Codebreakers. Lecture Notes in Computer Science(), vol 9100. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-49301-4_28
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