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Source: ACM Queue

In October 1983, Dennis Ritchie and Ken Thompson received the Turing Award for their work on Unix. Thompson's lecture, reprinted in Communications of the ACM under the title "Reflections on Trusting Trust," explained in three steps how to modify a C compiler binary to insert a backdoor when compiling a target program, leaving no trace in any source code. This article revisits that backdoored compiler, presenting the original code Thompson wrote more than 50 years ago.