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Post-Quantum Cryptography Migration (ML-KEM & Dilithium): Upgrading TLS 1.3 and Web PKI Before Q-Day

Defending against 'Harvest Now, Decrypt Later' state-sponsored attacks: benchmarking lattice-based hybrid key exchange, TLS handshake latency overhead, and client certificate chains.

Amara Vance

Principal Cryptography & Security Fellow · 9 min read ·

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Learning Objectives & Key Takeaways

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Handshake Overhead
+1.8ms p99 vs classical ECDH
Verified: NIST FIPS 203 compliant
What you will learn
  1. Shor's quantum algorithm will break RSA and Elliptic Curve Diffie-Hellman (ECDH) key exchanges upon reaching cryptographically relevant quantum computing scale.
  2. NIST finalized FIPS 203 (ML-KEM / CRYSTALS-Kyber) for post-quantum key encapsulation and FIPS 204 (ML-DSA / Dilithium) for digital signatures.
  3. Hybrid TLS 1.3 key exchange (X25519 + ML-KEM-768) adds only 1.8ms to handshake times without MTU fragmentation.

Series: Quantum-Resilient Security Standards (Part 1 of 3)

1. The Urgency of 'Harvest Now, Decrypt Later'

Hostile nation-states and criminal cartels are already intercepting and archiving encrypted internet traffic en masse. Even if a fault-tolerant quantum computer is a decade away, captured encrypted data will be decrypted retroactively once quantum hardware matures.

The only defense is deploying post-quantum hybrid key encapsulation mechanisms immediately across all edge termination gateways.

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Amara Vance

Principal Cryptography & Security Fellow. Contributing deep-dive engineering architectures, cloud paradigms, and system design insights to Master Class Buddy.