Thompson's Trojan Compiler

Question

I\'m trying to grasp a better understanding of Thompson\'s Trojan Compiler (discussed in his 1984 ACM Turing Award speech \"Reflections On Trusting Trust\"), and so far this is

Answer 1

I had never encountered the concept before, but this is pretty interesting - I found a neat write-up at http://scienceblogs.com/goodmath/2007/04/strange_loops_dennis_ritchie_a.php