HMAC with SHA384: HMAC, otherwise known as hash-based message authentication code, is a cryptographic method that works by calculating the hashes of two different inputs in order to generate a unique key used to verify data integrity.ProtonVPN uses 4096-bit RSA encryption because security professionals consider 2048-bit RSA keys secure, but they went the extra mile with 4096-bit RSA encryption. However, it's slower than AES, so it's common in VPNs to use RSA to encrypt keys. 4096-bit RSA: RSA encryption is another kind of encryption whose goal is to encrypt each bit of information.The US government uses AES-256 to encrypt top-secret information for this reason. AES-256 (Aes with a 256-bit key) is the most popular cipher in the encryption space because it’s quick, secure, and doesn’t require much computing power. AES-256: Advanced Encryption Standard (AES) is a cipher that encrypts your data with a key length of 128-, 192-, or 256-bits.ProtonVPN uses the most advanced encryption to protect your privacy with 256-bit AES, 4096-bit RSA, and SHA384 HMAC. ProtonVPN offers the split tunneling feature for Windows and Android. For example, this feature would let you use the Web in France when connected to the USA server of your VPN service, plus watch Netflix US at the same time. Using this feature, you can access the Internet through public unencrypted Wi-Fi connections and still have encrypted browsing. ProtonVPN creates two tunnels: one goes to a location specified by you directly, and the second routes your traffic through a VPN-encrypted tunnel. VPNs work by making an encrypted tunnel to send all the web data through. ProtonVPN's Secure Core servers are hosted by specially-selected partners in hardened data centers and protected by strong privacy laws. It means that even if an adversary (such as a government or ISP) monitors the traffic from the VPN servers, they won't be able to see your actual IP address or match your activity on the Internet to your IP address. When using ProtonVPN's Secure Core architecture, your traffic is routed through multiple servers before leaving the ProtonVPN network.

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