In recent months, an odd message has popped up on some radical Islamic Web sites. Readers are encouraged to use their computers to advance the cause of jihad. One preferred method touted on these sites: launch a cyberattack by jamming the Web sites and e-mail addresses of the "Zionist enemy." "Almost every [Islamic extremist] Web site has a section on how to do jihad over the Internet," says Rita Katz, the head of the SITE Institute, a group that closely monitors Islamic Web sites. The...

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