Proton
Empowering you to choose a better internet where privacy is the default. Protect yourself online with Proton Mail, Proton VPN, Proton Calendar, Proton Drive. Proton Pass and SimpleLogin.
Proton Mail is the world's largest secure email provider. Swiss, end-to-end encrypted, private, and free.
Proton VPN is the world’s only open-source, publicly audited, unlimited and free VPN. Swiss-based, no-ads, and no-logs.
Proton Calendar is the world's first end-to-end encrypted calendar that allows you to keep your life private.
Proton Drive is a free end-to-end encrypted cloud storage that allows you to securely backup and share your files. It's open source, publicly audited, and Swiss-based.
Proton Pass Proton Pass is a free and open-source password manager which brings a higher level of security with rigorous end-to-end encryption of all data (including usernames, URLs, notes, and more) and email alias support.
SimpleLogin lets you send and receive emails anonymously via easily-generated unique email aliases.
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"Private" as in only you and Proton can access the messages' unencrypted contents?
This is a far cry from any other of their products where they can't access the user's data.
https://fosstodon.org/@notesnook/114927444378333659
"Your chats with Lumo are stored with zero-access encryption, so Proton can't see your chat history. Only you can securely access your conversations by logging in to your Proton Account."
Keywords being "stored" and "history".
The LLM doesn't operate with encryption, so it is served and extrudes unencrypted data.
Proton operates the LLM, meaning Proton has access to your unencrypted data.
Comparatively, Proton Drive doesn't leak your files' contents at any point, even to Proton.
The data are not logged, not used to improve the AI, as stated. https://proton.me/support/lumo
Stated can be a long way away from reality. That website statement can be changed at a whim and doesn't have any legal binding.
If you wanna rely on encryption to protect your privacy, you have to be encrypted/protected from the service provider too, that's what E2EE is all about, and what many of Proton's services provide, but Lumo not.
Where are you finding Lumo is not E2EE?
From their own response (and due to logical thinking about how the LLM service works): https://fosstodon.org/@notesnook/114927444378333659
Strictly speaking, if you consider Lumo's GPU servers to be one of the "ends", then yeah, it is E2EE (you and the server being the ends).
But Proton own the GPU servers, and therefore have access to their private keys, so they can decrypt your messages as they arrive, before they're deleted, which happens after they're encrypted with your asymetric key (so only you can read it) and stored with zero-access.
I don't consider this safe. In a system where you are only interfacing with a computer (and not other users), E2EE should mean that only you have access to the unencrypted data, at any given time. Which is how Proton Drive works.