Amazon Researcher Claims Quantum Algorithm Could Challenge PQC Foundations

A preliminary paper by an Amazon Web Services cryptographer presents a polynomial-time quantum algorithm for the Dihedral Coset Problem, a result that, if validated, could strengthen the theoretical case that quantum computers can efficiently solve lattice problems underlying much of today’s post-quantum cryptography. The research builds on earlier theoretical work connecting the Dihedral Coset Problem to lattice mathematics by proposing a new algorithm that removes a key limitation in previous approaches while claiming tolerance for certain faulty quantum samples. The paper does not demonstrate a practical attack on standardized post-quantum cryptography or estimate the quantum hardware required, and researchers are expected to closely examine the proof and its implications before drawing conclusions about real-world cryptographic security. A preliminary paper from an Amazon Web Services cryptographer describes a polynomial-time quantum algorithm for a long-standing mathematical problem whose solution could have implications for lattice-based cryptography, the foundation of many post-quantum encryption…