AES has a maximum key size of 256 bits (AES-256), with the US government deeming AES-256 sufficient to secure “top secret” information. It’s certified by the National Institute of Standards and Technology (NIST) and used by the United States government to secure classified data. The technologies used by most modern implementations of OpenVPN (including Proton VPN’s) are: AESĪdvanced Encryption Standard (AES) is a symmetric-key cipher used to encrypt and decrypt the data transmitted over your VPN connection. OpenVPN uses several cryptographic technologies to keep your data safe and has no known vulnerabilities. Proton VPN supports OpenVPN on all our apps: ![]()
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