Every VPN uses a protocol to encrypt your traffic — but WireGuard, OpenVPN, and IKEv2 make very different trade-offs between speed, security, and compatibility. Here's what each one actually does.
When you connect to a VPN, your traffic is encrypted using a protocol — a set of rules that governs how data is packaged, encrypted, and transmitted between your device and the VPN server. The protocol you use affects your connection speed, security level, battery life on mobile devices, and how well the VPN works on restricted networks. Most VPN apps let you choose your protocol or switch automatically, but few explain what the choice actually means.
WireGuard is the newest major VPN protocol and is now the default for most top-tier VPN services. It uses state-of-the-art cryptography (ChaCha20 for encryption, Curve25519 for key exchange) and has a codebase of roughly 4,000 lines — compared to OpenVPN's 400,000+ lines. Smaller code means fewer places for vulnerabilities to hide and easier security auditing. WireGuard is significantly faster than older protocols, uses less battery on mobile, and reconnects almost instantly when your network changes. For most users, WireGuard is the right choice.
OpenVPN has been the industry standard for over two decades and remains the most widely audited and trusted protocol for high-security use cases. It runs over TCP or UDP, is highly configurable, and can be set up to run on port 443 (the same port as HTTPS traffic) — making it very difficult to block. OpenVPN is slower than WireGuard and uses more battery, but its long track record and extensive auditing make it the preferred choice for corporate VPNs and users in countries with aggressive VPN blocking.
IKEv2/IPSec is the protocol of choice for mobile devices. It's built into iOS and Android at the operating system level, reconnects extremely quickly when you switch between Wi-Fi and cellular (a feature called MOBIKE), and is very battery-efficient. The downside is that IKEv2 is easier to block than OpenVPN — it uses specific ports that firewalls can target. For everyday mobile use where blocking isn't a concern, IKEv2 is excellent. For use in restrictive countries, OpenVPN or WireGuard is more reliable.
Protocols to avoid: PPTP (Point-to-Point Tunneling Protocol) is a legacy protocol from the 1990s with known security vulnerabilities — it should never be used for anything sensitive. L2TP/IPSec is better than PPTP but slower than modern alternatives and has been suspected of NSA compromise based on Snowden documents. If your VPN only offers PPTP or L2TP, it's time to switch providers.
Proprietary protocols — like NordVPN's NordLynx (built on WireGuard), ExpressVPN's Lightway, or Hotspot Shield's Hydra — are increasingly common. These are typically WireGuard or OpenVPN derivatives optimized for the provider's specific infrastructure. They can offer better performance than standard protocols on that provider's network, but they're less independently audited. Check whether the provider has published third-party audits of their proprietary protocol before trusting it for sensitive use.
Safety 1st Editorial Team
This article is credited to Safety 1st Editorial Team. Safety 1st Consumer Protection has republished this content with attribution.