white hat

[hwahyt hat, wahyt]
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.
Compare black hat.
Related formswhite-hat, white-hat·ted, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for white hat

white hat

  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
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