http://www.technologyreview.com/articles/05/02/issue/feature_terror.asp
David Talbot
"Some work is already going on in the broader battle against terrorist use of the Internet. Research labs are developing new algorithms aimed at making it easi?er for investigators to comb through e-mails and chat-room dialogue to uncover crimi?nal plots. Meanwhile, the industry?s anti-spam efforts are providing new tools for authenticating e-mail senders using cryptography and other methods, which will also help to thwart fraud; clearly, terror?ist exploitation of the Internet adds a ?national-security dimension to these efforts. The question going forward is whether the terrorist use of the medium, and the emerging responses, will help usher in an era in which the distribution of online content is more tightly controlled and tracked, for better or worse."
