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Short for Internal Nonhostile Structured, it is a threat defined by Symantec Corporation to mean an individual within an organization who has physical access to network components. This individual may not motivated to disrupt mission operations but can do so by making common mistakes. Individuals executing INS threats are usually skilled and have tools to assist them in performing security-related functions.

Contrast with INU (Internal Nonhostile Unstructured).

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