As far as I am aware, a radio signal is basically just shouting into the void, and anyone who is tuned to the correct channel can hear you clear as day, like a car radio. So, how do militaries keep their radio signals from being over heard by the enemy? Do they have special radios, or are the communications sent over radios just not that important strategically?
In: Technology
The actual technology is very much ”If you know it you dont talk of it” But the basic encryption is just using an algorithm to scramble the message and Send it through multiple predefined frequencies. Unless your receiving end knows the exact sequence all they hear is static mess- even if listening to every frequency in the sequence simultaneously.
Note; this doesnt mean it cannot be intercepted, So your very basic trigonometry can still locate the source If the transmission; hence brevity (short transmissions) and sometimes built-in scrambling that sends the whole bunch as a shorter-duration pulse.
But; radios are just one part of comms, and rest of it goes past ELI5 level.
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