Very often news media reports show that when violent crimes occur, such as murder, one is more likely to be attacked by someone one does not know. However, real official police and court records show otherwise. This is also the case in network security. Research data from many reputable agencies consistently show that the greatest threat to security in any enterprise is the guy down the hall. 

In 1997, the accounting firm Ernst & Young interviewed 4,226IT managers and professionals from around the world about the security of their networks. From the responses, 75 percent of the managers indicated that they believed authorized users and employees represent a threat to the security of their systems. Forty-two percent of the Ernst and Young re…

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