&gt; Others, well, we&#x27;d need a Dyson sphere to brute force...<p>Not that I&#x27;m disagreeing with you but the German High Command thought much the same about the Enigma.<p>The only rational response in the face of the Snowden leaks is to assume everything is compromised and either defend in depth or simply not commit it to a computer (under the assumption what you are keeping private is <i>that</i> important).<p>If I was a high end cryptographer or someone in that sphere I&#x27;d also likely be (if they aren&#x27;t already) be using an air gapped machine, the threat is that pernicious.