The Conscience of a Hacker (also known as The Hacker Manifesto) is a short essay written on March 18, 1986, by Loyd Blankenship, a computer security hacker who went by the handle The Mentor, and belonged to the second-generation hacker group Legion of Doom.

It was written after the author's arrest, and first published in the underground hacker ezine Phrack. It can be found on many websites, as well as on T-shirts and in films.

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