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Within the US government, the Director of Central Intelligence Directive 6/3 (DCID 6/3) requirements for Protection Level 4 and 5 (PL-4 and PL-5), Integrity-High and Availability-High are required for multilevel security systems.
While some controlled interfaces are very complicated, others are very simple. A simple example of a controlled interface is a one-way data transfer system that moves data from a low security network to a high security network while assuring that high security data can never escape. One-way controlled interfaces are also called [[data diodes]]. For example, a fiber [[Network Interface Controller]] (NIC) with only one optical path is a data diode.
[[Category:Computer security]]
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