Encryption Standards Head-to-Head
Both Proton VPN Plus and Surfshark pack AES-256 encryption, the gold standard that banks and governments rely on. Proton sticks to GCM or CBC modes depending on the protocol, while Surfshark defaults to GCM for WireGuard, which adds authentication to prevent tampering. You won't find weak ciphers here—both avoid outdated stuff like Blowfish.
Protocols tell a similar story. Proton supports WireGuard, OpenVPN, and its Stealth protocol for dodging censorship. Surfshark offers WireGuard, OpenVPN, and IKEv2, plus a NoBorders mode that mimics regular traffic. WireGuard shines for security in both: audited code, fewer lines than OpenVPN, and ChaCha20 poly1305 for mobile-friendly encryption. Proton's apps are fully open-source, letting anyone inspect the code. Surfshark's apps aren't open-source, but their protocol implementations have passed independent audits. Edge to Proton if you obsess over source code visibility.
Kill Switch Breakdown
A kill switch cuts your internet if the VPN drops, stopping leaks. Proton's Always-On VPN and NetShield kill switch work across connections. It holds up in tests, though some users report rare reconnect hiccups on unstable networks. Surfshark's kill switch comes in two flavors: standard and system-wide (blocks all traffic). It generally triggers faster, especially on desktops.
Both handle IPv6 leaks with full blocks. DNS leaks? Proton routes everything through its own servers by default. Surfshark does the same but adds a manual option to use custom DNS. In practice, neither leaks easily if set up right. Surfshark feels snappier for the switch activation, but Proton's integration with its firewall adds an extra layer.
Leak Protection in Depth
WebRTC, DNS, and IP leaks can expose you even with encryption. Proton blocks WebRTC by default and uses full-tunnel DNS. Their Secure Core feature routes traffic through hardened servers in privacy-friendly countries first, like Switzerland or Iceland. It's like double-hopping by design, reducing attack surfaces.
Surfshark matches with CleanWeb to block trackers and a Bypasser for split-tunneling without leaks. Their MultiHop adds manual double-VPN, and RAM-only servers wipe data on reboot—no logs or traces left. Both score clean on leak tests from sites like dnsleaktest.com. Proton's Secure Core gives it a structural advantage for high-threat users; Surfshark's flexibility suits most.
No-Logs Policies Under the Microscope
No-logs means no storing your activity, IP, or timestamps. Proton, based in Switzerland, swears by it—court-proven in the past with empty hands to hand over. They've undergone multiple audits by Securitum, confirming zero activity logs.
Surfshark, under Dutch jurisdiction (14-Eyes), claims the same and backs it with audits from Deloitte, Cure53, and others. No connection logs, no IPs, no timestamps beyond session bandwidth for abuse prevention (deleted in 15 minutes). RAM disks on servers ensure nothing persists. Both policies hold water, but Proton's non-14-Eyes home base tips the scale for paranoia levels.
Proton: Swiss privacy laws, open-source apps, repeated audits.
Surfshark: Multiple third-party audits, RAM servers, quick-delete bandwidth logs.
Proton edge: Jurisdiction avoids mass surveillance alliances.
Surfshark counter: Proven audits under tougher scrutiny.
Tiebreaker: Your threat model—state actors favor Proton.
Audits and Transparency
Trust but verify. Proton releases annual transparency reports and open-sources clients for community review. Their 2023 audit covered apps, servers, and policy—no issues found.
Surfshark goes audit-heavy: server infrastructure by Cure53, CleanWeb by AV-Comparatives, apps by independent firms. They publish results publicly. Proton wins on open-source; Surfshark on audit volume. Both transparent enough for experts.
Server Security Features
Protons Secure Core servers run in physically secure data centers, with onion routing over VPN for extra hops. All servers use diskless setups now, matching Surfshark's RAM-only approach from day one. Surfshark adds Dynamic MultiHop with automatic server selection for obfuscation.
Proton has fewer servers (3,000+), focused on quality. Surfshark's 3,200+ emphasize speed but with Naked Onion (Tor over VPN) and Shadowsocks options. Both mitigate DDoS via anycast routing. Secure Core makes Proton tougher against traffic analysis.
Bonus Security Tools
Proton bundles NetShield for malware and ad blocking at the DNS level, plus Perfect Forward Secrecy everywhere. Surfshark's CleanWeb does similar, with antivirus via Incogni integration (separate add-on). Surfshark's Camouflage mode hides VPN use; Proton's Stealth does that for restrictive networks.
Port forwarding? Surfshark has it (riskier for security). Proton skips it to avoid exposure. Both support split-tunneling securely. These extras don't redefine security but show thoughtful design.
Final Thoughts
Security-wise, Proton VPN Plus edges out for high-stakes users. Secure Core, open-source everything, and Swiss base build a fortress against advanced threats. Surfshark holds its own with relentless audits, RAM servers, and flexible tools—often matching or beating Proton in everyday protection.
Neither is "bad." Pick Proton if nation-state worries keep you up; Surfshark if you want no-fuss reliability without compromises. Test both risk-free—your setup decides the winner. Security stacks high on both, so layer with good habits like 2FA and updates.