How to Prepare Your TLS Stack for Post-Quantum Cryptography Today

If you've been ignoring the "quantum computing will break encryption" headlines for the last few years, I get it. It felt like a distant problem. But NIST finalized its first post-quantum cryptography standards in 2024, major browsers already support hybrid key exchange, and the timeline for "harvest now, decrypt later" attacks is... now. That's happening today. So let's talk about what's actually breaking, why it matters for your services right now, and how to start migrating before you're scrambling. The Problem: Your TLS Handshakes Have an Expiration Date Here's the core issue. Most TLS connections today use key exchange algorithms like X25519 or ECDH (Elliptic Curve Diffie-Hellman). These rely on mathematical problems that classical computers can't efficiently solve — but quantum computers can, using Shor's algorithm. The scary part isn't that quantum computers will break your encryption tomorrow. It's that adversaries are already recording encrypted traffic today, planning to decr