What Is WireGuard VPN?
🔍 Quick answer:
WireGuard is a modern, open-source VPN protocol built for speed and simplicity. It uses cutting-edge cryptography (ChaCha20, Curve25519) and runs in the Linux kernel, giving you 2-3x faster speeds than OpenVPN. Most major VPNs (NordVPN's NordLynx, ExpressVPN's Lightway, Surfshark, Mullvad) use WireGuard as their default protocol.
How WireGuard works
Unlike OpenVPN, which carries around 100,000+ lines of code, WireGuard is built with ~4,000 lines of clean, auditable code. This makes it easier to audit, faster to run, and harder to break.
Faster speeds
WireGuard runs inside the OS kernel, so packets travel faster than with userspace protocols like OpenVPN.
Modern cryptography
Uses ChaCha20 for encryption, Poly1305 for MAC, Curve25519 for key exchange — all state-of-the-art.
Tiny codebase
~4,000 lines of code vs OpenVPN's 100,000+. Less surface area for bugs and security issues.
WireGuard vs OpenVPN vs IKEv2
| Feature | WireGuard | OpenVPN | IKEv2 |
|---|---|---|---|
| Speed | ⚡ Fastest | 🐢 Slower | ⚡ Fast |
| Code size | ~4,000 lines | ~100,000 lines | OS-level |
| Best for | Speed, streaming | Compatibility | Mobile, stability |
Which VPNs use WireGuard?
- NordVPN — implemented as "NordLynx" (adds double-NAT for privacy)
- Surfshark — uses WireGuard by default for most connections
- Mullvad — pioneered WireGuard-only deployment
- ProtonVPN — supports WireGuard on all platforms
💡 Pro tip: WireGuard is the fastest protocol for most use cases (streaming, gaming, downloads). If your VPN app has a protocol picker, choose WireGuard first; fall back to OpenVPN only if you need obfuscation or you're on an older device.
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Terms you'll meet
- IP address
- Your device's public ID online.
- Encryption
- Scrambling data so only you can read it.
- No‑logs policy
- VPN doesn't store your activity.