One who intrudes; one who thrusts himself in, or enters without right, or without leave or welcome; a trespasser.
A person who enters a private residence or place of business with the intention to perform a criminal act; as, killed by an intruder.
An image from the Faces at Bates archive, added to body copy, with link to additional text about the person, etc.
someone who intrudes on the privacy or property of another without permission
Person or software interested in breaking computer security to access, modify, or damage data. Also see Cracker.
a person who attempts to gain unauthorized access to a system, to damage that system, or to disturb data on that system
An entity that gains or attempts to gain access to a system or system resources without having authorization to do so.
any unauthorized individual who tries to access a computer system from outside; also referred to as an attacker.