Fast Post-Quantum Ring Signature from Power Residue PRFs with QROM Security

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Ring signatures enable a user to sign anonymously on behalf of a group, providing a fundamental building block for privacy-preserving applications such as anonymous credentials and private transactions. Existing post-quantum constructions, however, face a persistent tension between efficiency and rigorous quantum security: practical schemes are typically analysed only in the classical random oracle model (ROM), whereas schemes with proofs in the quantum random oracle model (QROM) either incur mu