Cryptology ePrint Archive: Report 2020/072

Anonymous Tokens with Private Metadata Bit

Ben Kreuter and Tancrede Lepoint and Michele Orru and Mariana Raykova

Abstract: We present a cryptographic construction for anonymous tokens with private metadata bit, a primitive that enables an issuer to provide a user with anonymous trust tokens that can embed a single private metadata bit, which is accessible only to the party who holds the secret authority key and is private with respect to anyone else. Our construction provides unforgeability, unlinkability and privacy for the metadata bit properties.

Category / Keywords: cryptographic protocols /

Date: received 23 Jan 2020

Contact author: benkreuter at google com,tancrede@google com,michele orru@ens fr,marianar@google com

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Version: 20200123:181646 (All versions of this report)

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