Quantum-Resilient Infrastructure: Migrating US Financial Payment System to Post-Quantum Cryptography (PQC) Standards to Prevent ‘Harvest Now, Decrypt Later’ Attacks

Compares classical RSA/ECDSA and ECDH paths with ML-KEM-768, X25519, ML-DSA-65, and dual-signing workflows to illustrate mitigation of Harvest Now, Decrypt Later exposure in financial payment infrastructure.