
They also publicly declared they would invest in third-party security audits. You can go to their GitHub and read through all their documentation yourself. Not that long ago, they did a complete 180 turn and went open-source with all of their apps.

In the past, ProtonVPN used to be a closed source provider, like many other VPN providers on the market. Still, it hardly solves the lack of Wireguard – a currently rising tunneling protocol that is not only very secure but much faster. IKEv2 is a good addition available on their mobile apps. To establish a connection between your device and the VPN servers, the service uses several tunneling protocol options: OpenVPN (TCP or UDP variant) and IKEv2/IPsec. For you as a VPN user, this means that no one will be intercepting to see what you're doing online. So, it's using a key length of 256 bits, which is unbreakable by brute force even with the most powerful current hardware. Like many popular VPN service providers, ProtonVPN uses AES-256-CBC encryption for its connections to the server fleet. On top of that their privacy policy promises no logs and no collection of user information.

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All of their apps are open-source so everyone can inspect their code to verify that it's safe to use. It's equipped with powerful AES military-grade encryption and tunneling protocols. ProtonVPN is as safe and secure as VPN services go.

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