This bit is interesting:<p>&quot;Thanks also to the Dropbox product security team for feedback on docs and signal&#x2F;noise issues&quot;<p>Dropbox, as I remember it, is distributed as &quot;encrypted&quot; pyc files and a modified python runtime that decrypts them.  This implies that &quot;secrets&quot; are in their python runtime binary.[1]<p>Makes you wonder what their feedback on signal&#x2F;noise was,then...perhaps something that kept this from being used to trivially retrieve the keys :)<p>[1] <a href="https:&#x2F;&#x2F;www.google.com&#x2F;url?sa=t&amp;rct=j&amp;q=&amp;esrc=s&amp;source=web&amp;cd=2&amp;cad=rja&amp;uact=8&amp;ved=0ahUKEwjcvMTKt-vKAhWhloMKHSEZB50QFghEMAE&amp;url=http%3A%2F%2F0b4af6cdc2f0c5998459-c0245c5c937c5dedcca3f1764ecc9b2f.r43.cf2.rackcdn.com%2F12058-woot13-kholia.pdf&amp;usg=AFQjCNEkxjJCRSHvlUSJq6GcOW97ieZp_A&amp;sig2=IUF09dc40fq8G0kUFWI3CQ" rel="nofollow">https:&#x2F;&#x2F;www.google.com&#x2F;url?sa=t&amp;rct=j&amp;q=&amp;esrc=s&amp;source=web&amp;c...</a>