black hat hacker

Definition

Electronics

  • A hacker which upon discovering a security vulnerability uses it to steal, damage, or otherwise harm. This contrasts with a white hat hacker, who alerts the owner, administrator, or the like, of the breach. A gray hat hacker lies somewhere in between, and may, for instance, post security flaws on the Internet.
http://www.dictionarycentral.com/definition/black-hat-hacker.html