GPS as a Key Distribution Platform

7 hours ago

U.S. military has potentially broadcast encryption codes via GPS satellites for about 20 years, acting as a covert 'numbers station'.
Steven Murdoch identified a specific signal on May 26, 2011, aligning with the rollout of military systems like Over-the-Air Distribution (OTAD) and Over-the-Air Rekeying (OTAR).
These automated systems enable remote rekeying of military GPS receivers, replacing manual distribution of cryptographic keys.
Military GPS modules have finite secure storage for key material, leading to concerns about future key reuse, reloading, or failure as keys are exhausted.

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