Intruder
This paper uses the term "intruder" to indicate a person who enters a computer system, or who accesses or modifies data,
and does not contain the appropriate authorisation to do so. Other terms are used in the public domain such as "hacker"
and "cracker", and these terms are continually debated for appropriateness. The term intruder is chosen here, as it indicates
the criminal and antisocial intent of the activity, as viewed by the author.