Will quantum computing break current encryption?

Quantum threat: sufficiently powerful quantum computers could break current asymmetric encryption (RSA, ECC), potentially compromising **TLS**, **DKIM** signatures, and **S/MIME**/**PGP**. "Sufficiently powerful" doesn't exist yet but is expected.

Timeline: estimates vary from 10 to 30 years for cryptographically relevant quantum computers. Harvest now, decrypt later attacks are already a concern for long-lived secrets.

Preparation: post-quantum cryptography standards are being developed (NIST standardization process). Organizations should plan for crypto agility, enabling algorithm updates when needed.