&gt;Given enough eyeballs backdoors can be easy to spot in source code<p>After looking at some examples of the Underhanded C contest (<a href="http:&#x2F;&#x2F;underhanded-c.org&#x2F;" rel="nofollow">http:&#x2F;&#x2F;underhanded-c.org&#x2F;</a>) and its predecessor, the Obfuscated V contest (<a href="http:&#x2F;&#x2F;web.archive.org&#x2F;web&#x2F;20110605000401&#x2F;http:&#x2F;&#x2F;graphics.stanford.edu&#x2F;~danielrh&#x2F;vote&#x2F;vote.html" rel="nofollow">http:&#x2F;&#x2F;web.archive.org&#x2F;web&#x2F;20110605000401&#x2F;http:&#x2F;&#x2F;graphics.st...</a>), I&#x27;m not so sure that well-implemented backdoors are easy to spot.