
Check the response of the call to api/authįrom this response we can retrieve the private key and a salt. Enter your username and password, submit the form. Open the devtools, go to the network tab. Here's how I did it anyway: ProtonMail Private Key and its Passphrase After searching in ProtonMail FAQ, it seemed exporting your private key isn't supported. The first thing that came to mind was to look for my private key to decrypt this email myself, and send it again. I was sending this email to an email address outside of ProtonMail which means that my friend would receive a cleartext version of this email while my mail box only keeps encrypted versions of an email. I don't know why this happened, my best guess is that the intermittent 4G connection I was getting from my subway car interrupted the communication between my mobile phone and ProtonMail servers which resulted in this. One week later, he replied something like "Excuse me?" with the encrypted version of the email I sent him. I hit "Send" and thought he would get it.
I took advantage of a long subway ride to write a lengthy email back. Last week I received an email from a good friend who's been traveling a lot lately and who doesn't get access to Internet that often. When you sign in on or in the mobile app to read your email, you receive your encrypted private key and the encrypted emails, the private key gets decrypted using your password (which never gets sent to their server), the decrypted private key is used to decrypt your emails.Incoming email is encrypted (using your public key) by ProtonMail before writing anything to disk.The encrypted key is sent to ProtonMail.The key gets encrypted with your password.When you sign up, a key gets generated client-side (in your browser).This means ProtonMail cannot read my emails: they are stored encrypted and ProtonMail doesn't have the key to decrypt them. It's an end-to-end encrypted email provider. I'll tell you how I recovered the private key from ProtonMail. And I'd like to take a minute just sit right there