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Direct Anonymous Attestations with Dependent Basename Opening

Abstract

We introduce a new privacy-friendly cryptographic primitive we call Direct Anonymous Attestations with Dependent Basename Opening (DAA-DBO). Such a primitive is a Direct Anonymous Attestation in which the anonymity can be revoked only if a specific authority, called the admitter, allowed to revoke the DAA signatures that include a specific basename. We also present an efficient scheme that achieves this functionality, secure in the random oracle model. Furthermore, we provide a prototype implementation of an anonymous transit pass system, based on this new primitive. Compared to previous privacy-friendly cryptographic primitives with partial linkability, we provide a way to share the power to open signatures between two entities which is more practical than the use of conventional techniques from threshold cryptography.
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Dates and versions

hal-01091165 , version 1 (04-12-2014)

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Nicolas Desmoulins, Roch Lescuyer, Olivier Sanders, Jacques Traoré. Direct Anonymous Attestations with Dependent Basename Opening. Cryptology and Network Security (CANS) 2014, Oct 2014, Heraklion, Greece. ⟨10.1007/978-3-319-12280-9_14⟩. ⟨hal-01091165⟩
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