Issuer-Hiding Attribute-Based Credentials with Verification of Issuer’s Attributes

In attribute-based credential (ABC) systems, a user can anonymously prove selected attributes certified by a credential that is issued from an issuer. As an extension of ABC system, an issuer-hiding ABC system was proposed, where the public key of the issuer can be hidden in the attribute proof to minimize the revealed information on the user. In the issuer-hiding system, a verifier defines accepted issuers to issue the signatures on the accepted issuers, and a user hides the issuer’s public key but proves the validity based on the signatures. In this paper, we propose an extended issuer-hiding ABC system, where selected attributes of the issuer can be also verified. Thus, the verifier can verify the issuer more flexibly based on the issuer’s attributes.