>>Basically, if you don't want it known, deliver it in person. (This is one way that the Germans were able to surprise the Allies at the Battle of the Bulge -- the CG didn't trust even the Enigma machine and sent written orders by couriers. Of course, Allied complacency played a large role as well.)<<

But this flies in the face that these electronic communications must be gathered without time to get warrants because of the incredible speed with which terrorist intelligence must be processed. Terrorists are likely doing exactly as you suggest--delivering messages in person. No wonder the neocon dream that technology would enable America to govern the world isn't quite working out.