Terrorist groups have stepped up their efforts to recruit members with sophisticated knowledge of computer engineering and hacking, according to intelligence officials. Whereas most extremist hacking activity in the past has been limited to defacing Web sites belonging to groups they consider enemies, terrorists may desire to aim more aggressive attacks against vital U.S. security systems, officials fear.

Terrorist groups that have long used the Internet to spread propaganda are increasingly tapping the Web to teach Islamic extremists how to be hackers, recruit techies for cyberwarfare and raise money through online fraud, U.S. officials say. A senior defense official said intelligence reports indicate extremist groups are seeking computer experts, including those capable of breaching government or other sensitive network systems.

The official, who spoke on condition of anonymity to discuss intelligence reports about the recruiting, said the extent and success of those recruiting efforts are unclear. However, jihadists' interest in hacking is evident in forums across the Internet. Law enforcement officials say terrorists are branching out into Internet fraud More about Internet fraud to raise money for their operations.

One Internet forum, the Mujahedeen Electronic Net, offers hacking instructions in a number of postings. A lengthy posting markets a weekly course and limits it to regular contributors to the Web site who confirm they are committed to Islam. The author of the offer claims the course will be taught by "experts in the electronic jihad," according to a translation of the posting.

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