The US Military Quietly Turned GPS Into a Global 'Numbers Station,' Evidence Suggests - Slashdot (opens in new tab)

A security researcher says evidence suggests the U.S. military has been using an obscure GPS message field for nearly 20 years to broadcast encrypted key-distribution data, effectively turning GPS satellites into a global "numbers station." The hidden-looking 176-bit messages appear tied to the Pentagon's Over-the-Air Distribution system for remotely updating cryptographic keys, meaning ordinary GPS receivers may have been receiving the traffic all along without anyone outside the military no...