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Researchers discovered that GPS satellites have been broadcasting encrypted military rekeying messages through a 176-bit field in the public L1 C/A signal for 19 years—effectively operating as covert numbers stations accessible to all receivers. This revelation exposes a significant transparency gap between civil and military GPS infrastructure, with 12.16 million encrypted payloads transmitted daily across the global satellite fleet. IT organizations managing GPS-dependent systems, signal security, or critical infrastructure must reassess their understanding of GPS signal composition and potential security implications of this undocumented military channel.