Intrusion Detection

Intrusion: Someone who attempts to break into or misuse a computer system (Intruders are commonly referred to as Hackers or Crackers):

Physical Intrusion: Intruder has physical access to the machine being intruded.

System Intrusion: Intruder is a low-privilege user on the system being intruded.

Remote Intrusion: Intruder attempts to enter system via remote access across the network.

Intrusion Detection System (ISD): A system designed to detect intrusion.

Network Intrusion Detection System (NIDS): Monitoring of packets on the network wire to discover if intrusion is attempted.

System Integrity Verifiers (SIV): Scans files to alert user to intruder changes.

Log File Monitors (LFM): Scans log files generated by network services for patterns that suggest intruder attack.

Outsiders: Intruders from outside the network. May originate intrusion from the Internet, dial-up lines, physical break-ins, or partner network.

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ner link to access intrude upon another network. Password cracking is a common method intruders use to gain access to networks. This is done in a variety of methods. Often the password cracked is revealed because of the obvious choice of a password by a user or administrator (i.e., their name, their child’s name, their pet’s name, etc.). This narrows down the choices for a potential hacker to type in to try and crack the password. Another password cracking method is the use of encoded dictionaries or thesauruses which will use all words in a dictionary or thesaurus to try and crack a password. Finally, a brute force attack is similar to a dictionary attack except that all possible combinations of characters are tried to crack a password of a certain number of letters “A short 4-letter password consisting of lower-case letters can be cracked in just a few minutes (roughly, half a million possible combinations)” (Graham 4). Sniffing unsecured traffic is a commonly used method of intrusion or gaining access to systems. There are three kinds of sniffing unsecured traffic: shared medium, server sniffing, and remote sniffing (Graham 5). On any Ethernet linked network, all one need do is apply a sniffer to the wire and all the t
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Approximate Word count = 4812
Approximate Pages = 19 (250 words per page)