> So they only store and pass the private key encrypted. I remember I was able to get key passed through the network in the not encrypted form, I was looking i

> So they only store and pass the private key encrypted. I remember I was able to get key passed through the network in the not encrypted form, I was looking into the network tab of the browser's dev console. When you do login look at the response of the https://mail.protonmail.com/api/auth https://mail.protonmail.com/api/auth POST query.