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At my old house I picked up pager traffic on a software defined radio and decoded it. Everything I've ever seen has been unencrypted.
Basically the pulses come from the towers the first X number of pulses are the address kind of like the phone number for the pager. All pagers listen to all pulses and just ignore the ones that aren't addressed to them.
Here's some details on one of the more popular protocols
https://www.raveon.com/pdfiles/AN142(POCSAG).pdf