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Good post! Challenge and response is crucial.
Instead of having just a couple of pairs (the enemy is listening too...)...you can decide on a code word (i.e. Canucks)....
Challenger: Charlie
Response: Alpha
...hmm..still not sure...Challenger: November
...come on numb nuts...Response: Uniform
Challenger: Ok! Come forward....
Change the code word a couple of times throughout the day...
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