I suggest reading this piece on the recent Jupiter vulnerability: <a href="http:&#x2F;&#x2F;blog.cryptographyengineering.com&#x2F;2015&#x2F;12&#x2F;on-juniper-backdoor.html" rel="nofollow">http:&#x2F;&#x2F;blog.cryptographyengineering.com&#x2F;2015&#x2F;12&#x2F;on-juniper-b...</a><p>&quot;The problem with cryptographic backdoors isn&#x27;t that they&#x27;re the only way that an attacker can break into our cryptographic systems. It&#x27;s merely that they&#x27;re one of the best. They take care of the hard work, the laying of plumbing and electrical wiring, so attackers can simply walk in and change the drapes.&quot;