a virtuous hero, especially in a cowboy movie; good guy.
a. a computer hacker who is hired by an organization to undertake nonmalicious hacking work in order to discover computer-security flaws
a white-hat hacker
Collins English Dictionary - Complete & Unabridged 10th Edition
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He seems like a white hat, but he's a worm.]]>
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Dictionary of American Slang and Colloquial Expressions
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.
Sometimes the new flaw exposed by the white hat creates widespread hacking opportunities.
He wears a shiny silver suit and a white hat with a feather in it.
Traditional law enforcement are often seen as the white hat agencies.