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Official Proton account, creator of Proton Mail, Proton Drive, Proton Pass, Proton VPN, Proton Wallet.
Tuta uses standard algorithms also being used by PGP (AES and RSA or ECC) for encrypting the entire mailbox. In addition, Tuta Mail already uses post-quantum cryptography (Kyber) for quantum safe accounts, which is still a work in progress for PGP. Furthermore, Tuta does not use an implementation of PGP itself because PGP lacks important requirements that we have for Tuta
Tuta isnt really a replacement for proton. They dont even support PGP encryption, which is kinda the whole point of proton.
Tuta Encryption