GGH - The odd word out here is a clue to the location of the next riddle.

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Across
  1. 4. A popular operating system.
  2. 5. Securing computer systems against unauthorized access.
  3. 6. Unethical practice of gaining unauthorized access to computer systems.
  4. 7. Act of impersonating a legitimate entity to deceive individuals or gain access.
Down
  1. 1. Desired outcomes.
  2. 2. Malicious software used to gain unauthorised access to computer systems.
  3. 3. Term for gaining access to a secure network through.