white-hat hacker； black hat, a malicious hacker,

Chaos Computer Club's wondrous nerd festival

The Chaos Computer Club (CCC) is one of the world's leading white-hat
hacker meetings and maker fairs, and its annual general meeting in Leipzig
this week is a celebration of digital arts and technology stunts.

White hat (computer security) - Wikipedia

https://en.wikipedia.org/wiki/White_hat_(computer_security)

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. Contrasted with black hat, a malicious hacker, the name comes from Western films, where heroic and antagonistic cowboys might traditionally ...