Definition: An Intrusion is an unauthorized access into an information system infrastructure and indicative of a security weakness in the system. An ill-intended breach to an information security system can either arrive on-line or in person. The illegal access of private information resources is a serious event. Unauthorized access to a computer or a network will likely result in the disclosure of confidential information and cause damage to the information system. Regardless, the business operations of the organization could be in jeopardy.

Its Relevance: An invasion of a computer or a network by an unauthorized individual is a serious matter. Individuals and organizations have obligations to maintain and protect confidential information (i.e. bank account numbers, social security numbers, etc.). Loss of proprietary data or control over a network could be disastrous to an organization’s survival and down-stream liability. Unauthorized access to an information infrastructure's digital assets is potentially devastating.

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