An Efficient SM9-Compatible Identity-Based Blind Signature Scheme for One-Time Issuance Identities

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We present an identity-based blind signature scheme built on the SM9 Chinese national cryptographic standard. The scheme outputs standard SM9 signatures, removes all online pairing operations through a single setup-time pre-computation, and adds only one user-side exponentiation to achieve blindness. We prove two properties rigorously: \emph{restricted target-identity unforgeability} (RTU) under the $Q$-BCAA1 assumption, and \emph{computational blindness} against a malicious signer in th