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   white hat

   noun

   • 1. a good or moral person, especially the hero in a film, novel, or play: "that account, dominated as it is by conflict between black hats and white hats, is hardly the whole truth"
   • ▪ a person who hacks into a computer network in order to test or evaluate its security systems: "while security dudes tend to speak in terms of black or white hats, it seems to me that nearly all hats are in varying shades of grey"

   Word Origin 1950s: from the colour of the hat traditionally worn by the good characters in westerns. Compare with black hat.

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