Definition of black hat in English:

black hat

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  • 1Used in reference to a bad person, especially a villain or criminal in a film, novel, or play: we are the good guys—the black hats lost
    More example sentences
    • "I want to see the white hats win and the black hats dangling from the end of a rope."
    • A cursory glance at the history of the conflict reveals it is not just the guys in the black hats who have found it useful.
    • This isn't an airport novel, with white hats and black hats, moral certitude and a nice conclusive ending.
  • 1.1 Computing , • informal A person who hacks into a computer network with malicious or criminal intent: black hats have a history of disassembling source code and looking for lapses
    More example sentences
    • If they do this with full knowledge and authorization of the affected company, they are white hats; if they criminally exploit the vulnerabilities, they are black hats.
    • The fact is, of course, that the computing world's black hat brigade don't give a monkey's what platform you're using.
    • According to security clearing house CERT, an exploit based on the vulnerability is yet to be used by black hats.


1950s: from the colour of the hat traditionally worn by the bad character in westerns. Compare with white hat.

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Word of the day coloratura
Pronunciation: ˌkɒlərəˈtjʊərə
elaborate ornamentation of a vocal melody