"Taxi drivers," Redouane el Habab said, referred to suicide bombers; explosives were "dough." Anybody who had to go to "the hospital," he added, had been taken to jail, while those visiting "China" were really attending training camps in Sudan.
Experts said the codes may not appear sophisticated at first glance but can be time-consuming to crack, especially if the targets are conversing in Arabic.
Some of the people quoted in the article seemed surprised that the terrorists are intelligent about avoiding surveillance. I'm hoping the intelligence experts are just trying to convince the world they have a hard job or somesuch. If they're honestly surprised that they have competent opposition, I'm worried.
Link thanks to Bruce Schneier.