Constant-Size Issuer Hiding for BBS Credentials via Randomizable Keys

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Anonymous credentials (AC) equip users with credentials on attested attributes, which enable them to prove data-minimizing statements over their attributes. However, in standard ACs, each credential presentation reveals the credential issuer, which could be more information than intended and necessary, e.g., when merely proving age or personhood. Issuer-Hiding Anonymous Credentials (IHAC) address this limitation and hide the issuer in the presentation. That is, they only reveal that the user has