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In 2006 the Privacy Rights Clearinghouse reported 327 data breach incidents, 100,453,730 potentially compromised records and 5 identity thieves who were sentenced after defrauding 238 victims. The data breaches were classified as coming from outside hackers, insider malfeasance, human/software incompetence, non-laptop theft and laptop theft. One of the biggest data breach's occurred at TJX, a major retail store, where hackers intruded their network at two stores and stole over 46 million debit and credit card numbers from more than 100 files over several years. The purpose of this paper is to draw from the literature to present the major issues regarding threats to the security of network data, define internal/external intrusion and provide a list of the common methods of detection.
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