Hacking a Terror Network: The Silent Threat of Covert Channels

Jimmy sat back in the hard wooden chair and waited as the web browser loaded. He had quickly become a regular at the library in this small town, using the computer several times a day, sometimes for hours at a time. His resolve and motivation had been strengthened when the perfect location for the second phase of attacks had occurred to him. The inability of the local authorities to secure the area, combined with the sheer number of Americans, made the target attractive. He had spent time wondering why this particular idea had never occurred to him or Salah before that moment. But in time, he had come to the conclusion that Allah was aware that Salah would betray the rest of the group and had saved that target for a time when it was safe to do so.
The web browser finally came up, and Jimmy typed the address to his web e-mail. There had been fewer and fewer e-mails messages sent back and forth between the team members as they grew increasingly more comfortable with the new mechanism for communicating. Jimmy had sent an e-mail message to the list of original group members, telling them all that he was changing accounts and would no longer be using the web page as a means of communication. Reply to this e-mail if you have the motivation to continue, he had written. I will contact you with the new information.
A few of the members had been lost,...