“Proton Mail is an email system which uses end-to-end encryption, making it impossible for outside parties to monitor.” Forbes By using open-source libraries, Proton Mail can guarantee that the encryption algorithms used do not have clandestinely built-in back doors. Proton Mail only uses secure implementations of AES, RSA, along with OpenPGP, while all of the cryptographic libraries used are open source. Proton Mail's open-source software has been thoroughly vetted by security experts from around the world to ensure the highest levels of protection. This means we don't have the technical ability to decrypt your messages. Data is encrypted on the client side using an encryption key that Proton does not have access to. Proton Mail's zero access architecture means that your data is encrypted in a way that makes it inaccessible to us.
This largely eliminates the risk of message interception. Messages are stored on Proton Mail servers using end-to-end encryption at all times and are transmitted securely between Proton servers and user devices.
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Proton Mail is encrypted email from Switzerland.