Deep-Dive: Implementing ML-KEM & Hybrid TLS Key Exchange at Global Edge Scale
Transitioning global web traffic to **post-quantum algorithms** presented significant packet overhead challenges due to public key size increases. While RSA-2048 public keys require 256 bytes, ML-KEM-768 public keys require 1,184 bytes, increasing client hello payloads and risking TCP packet fragmentation.
Key Takeaway & Industry Impact
A technical breakdown of ML-KEM lattice-based key exchange math, TCP packet fragmentation handling, and hybrid TLS performance metrics.
Cloudflare solved this by engineering optimized TLS stack routines that pack hybrid key shares efficiently within standard Maximum Segment Size (MSS) windows. Modern hardware acceleration for vector instructions (AVX-512 and ARM NEON) was leveraged to perform polynomial multiplication in under 15 microseconds per connection handshake.
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This architecture establishes a blueprint for enterprise networks racing to meet upcoming regulatory mandates for post-quantum cryptographic migration.