VPN Protocols Explained

WireGuard — Fastest Modern Protocol

WireGuard is the newest and fastest VPN protocol. It uses just ~4,000 lines of code (vs 400,000+ for OpenVPN), runs in the Linux kernel, and uses state-of-the-art cryptography: ChaCha20-Poly1305 for encryption, Curve25519 for key exchange, BLAKE2s for hashing, and SipHash24 for hashtable keys.

• Speed: 3-4x faster than OpenVPN. Near-native network speeds on modern hardware.
• Security: Minimal attack surface due to tiny codebase. Easily auditable.
• Connection: UDP only, port 51820 by default. Instant reconnection.
• Weakness: Static IPs logged on server by default (mitigated with WireGuard-go configurations). Not stealthy — easily identified as WireGuard.
• Best for: Maximum speed, gaming, streaming, modern devices.

OpenVPN — Battle-Tested Standard

OpenVPN has been the industry gold standard since 2001. It runs over TLS and supports both TCP and UDP. Highly configurable with certificate-based authentication.

• Speed: Slower than WireGuard due to user-space implementation and TLS overhead.
• Security: AES-256-GCM encryption, RSA-4096 certificates, HMAC-SHA256 integrity. Extremely well-audited.
• Connection: TCP (port 443 — same as HTTPS, harder to block) or UDP (port 1194).
• Stealth: TCP/443 mode is hard to block without breaking HTTPS, but DPI can still identify OpenVPN traffic.
• Best for: Corporate environments, maximum compatibility, high-security requirements.

V2Ray (Vmess & Vless) — DPI Bypass Expert

V2Ray (now maintained as Xray-core) is a platform for building VPN proxies. Vmess and Vless are its two main protocols:

Vmess

Original V2Ray protocol. Encrypted with AES-128-GCM or ChaCha20-Poly1305. Supports WebSocket, gRPC, HTTP/2 as transport layers — disguises traffic as normal web traffic to bypass Deep Packet Inspection (DPI).

Vless

Lighter version of Vmess without response authentication. Uses XTLS (direct TLS passthrough) for zero-overhead encryption when combined with TLS transport. Faster than Vmess.

• Stealth: Excellent — traffic looks like HTTPS. Works through Cloudflare CDN (CDN proxying masks server IP).
• Best for: Bypassing censorship in China, Iran, Russia. Maximum stealth.

Trojan — HTTPS Disguise

Trojan disguises VPN traffic as plain HTTPS traffic by operating directly on port 443 with a valid TLS certificate. To any observer, the traffic is indistinguishable from accessing a normal HTTPS website.

• How it works: Server runs as a HTTPS server. Invalid requests are forwarded to a real web server (e.g., Nginx). Valid Trojan clients get VPN tunnel. Completely transparent to DPI.
• Security: TLS 1.3 encryption. Certificate-based — requires a domain name and SSL certificate.
• Stealth: Highest among all protocols — even advanced DPI cannot distinguish Trojan traffic from HTTPS.
• Best for: Countries with the most aggressive censorship. Maximum stealth priority.

Shadowsocks — Lightweight Censorship Bypass

Shadowsocks is a SOCKS5-based proxy protocol originally designed to bypass the Great Firewall of China. It's lighter than V2Ray but still highly effective for censorship circumvention.

• Encryption: ChaCha20-IETF-Poly1305 or AES-256-GCM. Modern AEAD cipher modes.
• Speed: Very fast — minimal overhead compared to full VPN protocols.
• Stealth: Traffic looks random/encrypted to DPI. No clear protocol signature. Supports obfuscation plugins (obfs4, v2ray-plugin).
• Limitation: Proxy only (not a full VPN) — may not route all system traffic by default.
• Best for: Bypassing censorship quickly, light-weight proxy needs.

Protocol Comparison Table