
The difference is that Tutanota doesn’t use OpenPGP - or PGP at all, for that matter. It uses RSA for user-to-user communications and AES for user-to-non-user communications. Starting with ProtonMail, it’s an OpenPGP service, utilizing the long-standing email encryption standard: RSA for messages between users and AES for messages from a user to a non-user (read our description of encryption for more). Tutanota and ProtonMail take fundamentally different approaches to email security, despite the fact that the end result is mostly the same.

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Time Machine vs Arq vs Duplicati vs Cloudberry Backup.
