zlacker

>>eloran+(OP)
Look into the p25 standard. I wouldn't know but I wouldn't be surprised it many agencies use it for digital/analog data and can probably be brute forced with cheap hardware. Search for p25 DES-OFB. Now would be a great time for a rainbow table.

>>dvno42+w02
The same radios often/usually support AES as well, although at an additional cost. That's what one nearby PD uses.