Bridging the Cryptographic Transition: A Unified Framework for Post-Quantum Key Exchange

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In a widely publicized recent announcement, Google established a formal 2029 deadline for completing its post-quantum cryptography (PQC) migration---one that deliberately preempts the 2035 deadline set by NIST and the US federal government to complete the deprecation of classical public-key algorithms. Google cited faster-than-expected progress across three fronts: quantum computing hardware development; quantum error correction; and revised estimates of the resources required for quantum comput