A hacker who is legally authorized to use otherwise illegal means to achieve objectives critical to the security of computer systems, for example, someone hired to execute a penetration test upon a network to produce a report for its administrator about vulnerabilities and solutions to the networks security
(Bilgisayar) A white hat hacker, also rendered as ethical hacker, is, in the realm of information technology, a person who is ethically opposed to the abuse of computer systems. Realization that the Internet now represents human voices from around the world has made the defense of its integrity an important pastime for many. A white hat generally focuses on securing IT systems, whereas a black hat (the opposite) would like to break into them