Thank you! I saw Ken Thomson's classic Reflections on Trusting Trust linked on HN a couple weeks ago, and was looking forward to rereading this very same story

Thank you! I saw Ken Thomson's classic Reflections on Trusting Trust linked on HN a couple weeks ago, and was looking forward to rereading this very same story when I was surprised to discover it wasn't and had never been part of that essay at all. I had no idea where to find the actual story I'd been looking for! (Indeed, I was no longer sure this story had actually existed, and wasn't just something my brain had made up from cobbling together fragmentary memories) Thank you for solving this mystery. :)