Mechanism Design for Systemic Post-Quantum Cyber Risk:Incentive-Compatible Adoption, Equilibrium Guarantees, and Policy-Grade Algorithms

Abstract: This study investigates systemic post-quantum cyber risk as a governance and coordination problem in critical infrastructure, where cryptographic transitions interact with interdependent attack surfaces, heterogeneous operator costs, and policy constraints. A mechanism-design perspective is developed to formalize incentive-compatible adoption of crypto-agile controls under network externalities, and to derive equilibrium guarantees that remain meaningful under uncertainty about exploit