Post-Quantum Cryptography
Cryptography built on mathematics that a large quantum computer is not known to break - the replacement for today's key exchange and signatures.
Post-quantum cryptography covers algorithms designed to withstand attack by a large, fault-tolerant quantum computer. The exposure is specific rather than general: Shor's algorithm breaks the public-key mathematics behind RSA and elliptic-curve cryptography, which is what secures key exchange and digital signatures, while symmetric encryption and hashing are weakened but remain usable at larger sizes. So the migration is concentrated on how sessions establish keys and how signatures are made.
NIST published the first standards in August 2024: ML-KEM for key encapsulation as FIPS 203, and ML-DSA for digital signatures as FIPS 204. The reason to deploy before quantum computers exist is harvest now, decrypt later - traffic recorded today is cheap to keep and readable the moment the mathematics gives way, so any data whose value outlives the cost of storing the ciphertext is already exposed.
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