Almost every secure connection you make today rests on a single bet: that certain math problems are too hard to solve in any reasonable time. A large enough quantum computer breaks that bet. It doesn't exist yet — but the migration to survive it has already begun.
Harvest now, decrypt later
The threat isn't only in the future. Adversaries can record encrypted traffic today and simply wait — storing it until a quantum machine can crack it open. Anything that must stay secret for a decade is arguably already at risk.
The new math
Post-quantum cryptography swaps the vulnerable problems for ones believed hard even for quantum machines — lattices, hashes, error-correcting codes. The first standards are finalised, and the algorithms are being wired into browsers, messengers and VPNs now.
The migration
- Inventory every place cryptography is used
- Adopt hybrid schemes — classical + post-quantum together
- Design for crypto-agility, so algorithms can be swapped
- Prioritise long-lived secrets first
You don't want to be designing your quantum-safe migration the week the first machine works.
It's a quiet, unglamorous infrastructure project — the kind nobody notices until it's missing. Which is exactly why the careful teams are starting now.