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Defense-in-Depth

Defense-in-Depth — The use of multiple techniques to help mitigate the risk of one security measure being compromised or circumvented. An example is a building with an electronic card reader to permit and deny access and a receptionist in the same building who checks credentials before allowing access. An additional layer of defense would be training all employees to challenge people in restricted buildings who do not have proper credentials.

Источник: ICS-CERT