1

This doesn't necessarily have to be a physical break in, it can also apply to one who creates and distributes a virus that doesn't collect any information or corrupt any files, but alerts the user that they have a virus and should be more careful on the internet.

2

A "white hat", from the wikipedia link -

The term "white hat" in Internet slang refers to an ethical computer hacker, or a computer security expert, who specializes in penetration testing and in other testing methodologies to ensure the security of an organization's information systems.

  • 1
    Note: if the hacker doesn't have permission but is still benevolent in their intentions they may also be called a "grey hat." – pavja2 Jun 6 '14 at 5:29
  • 1
    @pavja2 +1 or inmate #0123456789 – Elliott Frisch Jun 6 '14 at 5:49

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