That&#x27;s a cool algorithm - and while it does reduce the risk of a hack succeeding I think it still could be considered a &#x27;backdoor&#x27;.  It&#x27;s just a backdoor that requires to people to work together to open, harder to compromise yes - but I&#x27;d argue still not really secure.<p>If you have a government entity routinely breaking into companies and taking over access to things (targeting sysadmins) then the scheme doesn&#x27;t work very well.  I think most of the argument behind encryption falls on this idea that it either is secure (no backdoors) or it isn&#x27;t.  You have a spectrum of insecure things you can do that are arguably better than nothing, but they&#x27;re not secure.