Demystifying Key Exchange: From Classical Elliptic Curve Cryptography to a Post-Quantum Future

Summary: The article explains that ECDHE, the elliptic-curve key exchange underpinning TLS and securing trillions of connections daily, relies on the elliptic curve discrete logarithm problem, which Shor's algorithm would make trivial for a sufficiently powerful quantum computer. NIST, after a multi-year competition, selected ML-KEM (formerly CRYSTALS Kyber) as the primary post-quantum key exchange algorithm, and Zscaler describes combining it with classical ECDHE in a hybrid approach so an attacker would have to break both.
What you should know: The article states the 'harvest now, decrypt later' threat is already real: adversaries can record encrypted data today and store it until a quantum computer can break it, which means traffic your organization sends now may already be compromised retroactively.

Read the original at The Hacker News ↗