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Who is a Black hat hacker

A black-hat hacker is a hacker who "violates computer security for little reason beyond maliciousness or for personal gain".
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The term was coined by Richard Stallman, to contrast the maliciousness of a criminal hacker versus the spirit of playfulness and exploration of hacker culture, or the ethos of the white-hat hacker, who performs hackerly duties to identify places to repair. The black-hat and white-hat terminology originates in Western films, where heroic and antagonistic cowboys might traditionally wear a white and a black hat respectively.
Black-hat hackers form the stereotypical, illegal hacking groups often portrayed in popular culture, and are "the epitome of all that the public fears in a computer criminal". Black-hat hackers break into secure networks to destroy, modify, or steal data or to make the network unusable for those who are authorized to use the network.

White hat hackers also identify security weaknesses; but, instead of performing malicious attacks and theft, they expose the security flaw in such a way as to alert the owner that there is a breach so they can fix it before a black hat hacker can take advantage of it. Though they often start out as black hat hackers, white hat hackers sometimes are paid consultants or actual employees of a company that needs its systems protected. Other types of hackers include: blue hat hackers & gray hat hackers.  Blue hat hackers are security professionals that are invited by Microsoft to expose vulnerabilities in Windows products. Gray hat hackers are hackers that perform both malicious activities and helpful ones.

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