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> Obviously those in the know would not use the flawed system

Perhaps the clearest argument against such a ploy is the TETRA radio system. Turns out in this case that "the masses" are our:

- police and emergency services

- military and civil defence forces

- diplomatic and political security, escorts, attaches and close security

You see the problem is this concept of "in the know". It's an insoluble information-hazard and boundary problem;

Two people can keep a secret, if one of them is dead.