this post was submitted on 17 Aug 2024
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An encrypted key is a useless blob. What matters is the decryption key for that key, which is your password (or a key derived from it, I assume), which is client side.
They can't sign with your public key. Signing is done using your private one, otherwise nobody can verify the signature.
Either way:
You can do it using the bridge, exactly like you would with any client-side tooling.
It's still insecure. They decryption process is still in the proton company hands and they could add some client specific code to log the password on the fly. Proton is obliged to follow the swiss law and I can imagine situation that police asks proton (+ gag order ) to log certain data for specific clients like passwords and ips. Still private keys are better to be stored separately. You can sync them easily if you with with either rsync or rclone
Exactly. There's no justification for them storing the private key online for "convenience". And key generation happens in the browser with JS. Which means it is possible to send backdoored JS to easily copy the private key.
Especially with the fact that: 1) deminificafion of the javascript code is not simple 2) you cannot "freeze" the code version you use. Still your computer does allow it ( minus the windows which follows the Microsoft thinking way, kidding about windows updates )