Ken Thompson: Reflections on Trusting Trust (1984) [pdf]

There's a dead comment on this from hell-banned user uaygsfdbzf that is quite worthwhile. It's short so I'll just quote it here:

"All trusting trust posts made in the past 9 years should also link to David A. Wheeler's Fully Countering Trusting Trust through Diverse Double-Compiling - http://www.dwheeler.com/trusting-trust/dissertation/html/whe... (or the poster will be condemned as lazy :-)"