“…An extreme example would be GPS satellites, where a secret cannot be shared with the receiver and kept secret from the adversary, because the "receiver" is every person on earth, including the adversaries. There is currently only one algorithm for achieving jam resistance with no shared secret in the presence of an adversary assumed to have infinite computational power: the BBC (Baird, Bahn, Collins) concurrent code [3], [4], [5], [6], [7], [8], [9], [10], [11], [12], [13], [14], [15], [16], [17], [18], [19], [20].…”