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Red/black concept
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==Red/Gray/Black== [[File:NSA Red-Gray-Black diagram.png|thumb|300px|NSA Red-Gray-Black diagram]] The NSA's Commercial Solutions for Classified (CSfC) program, which uses two layers of independent, commercial off-the-shelf cryptographic products to protect classified information, includes a red/gray/black concept. In this extension of the red/black concept, the separated gray compartment handles data that has been encrypted only once, which happens at the red/gray boundary. The gray/black interface adds or removes a second layer of encryption.<ref>[https://www.nsa.gov/Portals/70/documents/resources/everyone/csfc/capability-packages/MACPv2_1.pdf NSA Mobile Access Capability Package, Version 2.1], 26 June 2018, accessed 21 February 2021</ref>
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