That is called the Ken Thompson hack In 1984, he published a paper called: Reflections on trusting trust https://dl.acm.org/doi/10.1145/358198.358210 https://

That is called the Ken Thompson hack In 1984, he published a paper called: Reflections on trusting trust https://dl.acm.org/doi/10.1145/358198.358210 https://dl.acm.org/doi/10.1145/358198.358210