White hat (computer security)
（重定向自White hat hacker）
The term "white hat" in Internet slang refers to an ethical computer hacker, or a computer security expert, who specializes in penetration testing and in other testing methodologies to ensure the security of an organization's information systems. Ethical hacking is a term coined by IBM meant to imply a broader category than just penetration testing.
White-hat hackers may also work in teams called "sneakers", red teams, or tiger teams.