aes128 pagers are the most secure side-channel on the planet. also a kept secret in telcoms. add payload addressing per message and you can speak oneway to an

aes128 pagers are the most secure side-channel on the planet. also a kept secret in telcoms. add payload addressing per message and you can speak oneway to an unbounded number of pagers/devices, for only a few bucks a month. try doing that with cellular.