Groups -- People sometimes act as a group to steal information for any number of reasons. They may be a company's customer or vendor, or they may be a fierce competitor trying to steal sensitive trade secrets (Elifoglu, 2002).

Some common threat attack groups include the following:

Saboteurs/Terrorists/Paramilitary Groups;

Domestic or Foreign Criminals;

Vendors;

Customers;

Competitors; and,

Former Employees (Elifoglu, 2002).

In reality, the concept of intrusion detection systems is a straightforward matter of designing a system that can provide alerts when it is attacked. According to Andress (2003), the process of intrusion detection typically requires the identification of unauthorized access into computer systems. For example, this author notes, "Robust intrusion-detection systems are placed at strategic locations on the network to look for suspicious usage patterns so that attacks can be detected before an intruder has gained access to the network, application, or operating system" (Andress, p. 66). This author...
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