white hat

noun Informal.
a virtuous hero, especially in a cowboy movie; good guy. Compare black hat ( def 1 ).

white-hat, white-hatted, adjective
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World English Dictionary
white hat
 
n
informal
 a.  a computer hacker who is hired by an organization to undertake nonmalicious hacking work in order to discover computer-security flaws
 b.  Compare black hat (as modifier): a white-hat hacker

Collins English Dictionary - Complete & Unabridged 10th Edition
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Dictionary.com's 21st Century Lexicon
Main Entry:  white hat
Part of Speech:  n
Definition:  a computer programmer hired to prevent illegal acts such as hacking a forbidden network or sending out a virus or worm; also, a computer expert, usually a former hacker, who now uses his or her skills for legitimate causes; also called white hat hacker
Etymology:  fr its use in western /cowboy movies
Usage:  computing
Dictionary.com's 21st Century Lexicon
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Example sentences
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.
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