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One-time pads are the classic example of perfect secrecy. They are also the classic example of why perfect secrecy is not the same thing as practical security. This entry explains why the theory is so clean, why the history is so messy, and why the gap between the two shaped modern cryptography.
The NSA did not shape encryption in only one direction. This entry traces how the agency helped build modern secure communications, influenced DES, DSS, Clipper, AES, Suite B, and CNSA, and then reshaped public trust through the Dual_EC and BULLRUN era.
Project PYRAMIDER sits in the dangerous middle ground between real black-program history and sloppy satellite mythology. The name sounds like a listening satellite. It appears in espionage prosecutions tied to communications intelligence law. It belongs near RHYOLITE, AQUACADE, CANYON, CHALET, VORTEX, GRAB, POPPY, and other hidden Cold War space systems. But the strongest public record points somewhere more specific: PYRAMIDER was a CIA-commissioned TRW study for a worldwide covert satellite communications system that could let American agents in denied areas reach headquarters securely. That distinction matters. PYRAMIDER was not a proven spacecraft line. It was a classified communications concept whose documents became evidence in one of the most damaging contractor-access espionage cases of the 1970s.