Most VPN protocols are not quantum safe. IPsec and OpenVPN use RSA or ECDH key exchange, both vulnerable to Shor's algorithm.
Key Takeaway: VPN is NOT quantum safe. Deploy IPsec with hybrid ML-KEM + classical key exchange. Use QScout to assess current VPN cipher suites.
Most VPN implementations are NOT quantum safe. IPsec IKEv2 uses RSA or ECDH. OpenVPN relies on TLS with RSA or ECDH. WireGuard uses Curve25519. All are broken by Shor's algorithm. VPN traffic is a prime target for HNDL attacks because VPN tunnels carry concentrated, high-value data. Post-quantum VPN solutions are emerging: Cloudflare WARP has experimental PQC support.
| Full Name | Virtual Private Network Protocols |
| Category | infrastructure |
| Quantum Vulnerability | RSA, ECDH, and Curve25519 key exchange — all broken by Shor's algorithm. |
| NIST Status | NIST recommends transitioning VPN key exchange to ML-KEM (FIPS 203). |
| Deprecation Timeline | Classical-only VPN key exchange should be deprecated by 2030 (CNSA 2.0) |
| Replaced By | ML-KEM-768 or ML-KEM-1024 for VPN key exchange (hybrid mode during transition) |
Deploy IPsec with hybrid ML-KEM + classical key exchange. Use QScout to assess current VPN cipher suites.
QScout discovers every instance of VPN across your infrastructure in 7 days — with zero operational disruption. 72-hour time to first findings.