If I&#x27;m going to go the route of sharing a password, why wouldn&#x27;t I just put a .txt or .html file with my email body in a password-protected&#x2F;encrypted .7z or .zip and just send it with plain old gmail?  My buddy doesn&#x27;t have to change his email provider or click on any special links.<p>In addition to not having forward secrecy (if a 3rd party gets his crypto password, they get ALL of my messages to him), this seems to fail the classic &quot;In order to exchange a secret, first exchange a secret&quot; crypto usability test.