this post was submitted on 18 Jul 2024
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bit of a whoopsie walkback after caught pants down
totes normal. everyone has this all the time, amirite?!
let's see how many steps they take back
also I keep meaning to push on this and getting distracted:
fuck no, this breaks the security model for every proton user. one of the key assumptions of Proton’s end to end encrypted model is that the plaintext of a messsge never touches Proton’s servers, on both ends of the conversation. now if a proton business/visionary (and they keep fucking forgetting they forced their visionary accounts into having this horseshit) user sends me a message or a reply, there’s a chance the plaintext on their end was exposed to Proton’s servers, and as the receiver I can’t control or even detect the conditions that cause the plaintext leak (is the sender a proton business/visionary account? did they use the cloud version of the LLM? what text did it operate on?)
fucking unworkable. I’m not even a cryptographer, but this is the most obvious plaintext leak I’ve ever seen in a cryptography product.
and now, my swing at a secure version of this feature:
if I receive a message whose content was sourced from the cloud LLM (ie the user activated the feature at any point while writing), instead of pulling the content of the message, protonmail displays a warning that the content of the message was exposed to their servers, and I’m given buttons to either display the message, or delete it and block the sender. if I delete the message and block the sender, protonmail itself sends a message back to the message’s author proving that I deleted the message unopened.
I’m not kidding, that’s the only secure version of this. that’s the version a privacy-oriented company would have implemented, if they really had to do any of this at all (they didn’t)