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NSA/CSS Secure Telephone System


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Overview Edit

The NSA/CSS Secure Telephone System (NSTS) is the NSA's internal telephone network for calls up to the level of Top Secret/SCI. Newer NSTS phones are connected by fiber optic modems to a fiber backplane that interfaces with an NSANet access point router. The voice traffic is then encrypted together with data traffic utilizing a Type 1 bulk encryption device .

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