intrude + -er.
"intruder." YourDictionary, n.d. Web. 22 June 2018. <http://www.yourdictionary.com/intruder>.
intruder. (n.d.). Retrieved June 22nd, 2018, from http://www.yourdictionary.com/intruder
An attacker that gains, or tries to gain, unauthorized access to a system. See attacker, intrusion and IDS.
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