Definition of white hat
1
:one who is admirable and honorable
2
:a mark or symbol of goodness
- could use a few more guys in white hats
- —Robert Christgau
3
:a hacker who tests computer systems for possible vulnerabilities so that they can be fixed
- Chu, 33, is part of a fraternity known as "penetration testers" or "ethical hackers," a group of experts who are hired to hack into computer systems or find other ways to gain access. These so-called "white hats" will spend days or weeks searching company systems to come up with recommendations for fortifying corporations against such threats.
- —Greg Wiles
