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white hat

[hwahyt hat, wahyt]
See more synonyms for white hat on Thesaurus.com
noun Informal.
  1. a virtuous hero, especially in a cowboy movie; good guy.
  2. Digital Technology. a hacker who violates the security of a system with the knowledge and consent of the owner or developer in order to test the code, without malicious intent.
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Compare black hat.
Related formswhite-hat, white-hat·ted, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for white hat

Historical Examples

  • I casually looked round, and saw "White-hat" wink at-an officer, and point significantly to my handkerchief.

    The Fortunes of Hector O'Halloran, And His Man Mark Antony O'Toole

    W. H. Maxwell

  • And so saying, he of the white-hat and jeans coat stepped forward to the bar, and placed a couple of dollars upon the counter.

    The Quadroon

    Mayne Reid


British Dictionary definitions for white hat

white hat

noun
  1. informal
    1. a computer hacker who is hired by an organization to undertake nonmalicious hacking work in order to discover computer-security flaws
    2. (as modifier)a white-hat hacker Compare black hat
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012