The intelligence operative sits in a leather club chair, laptop open, one floor below the Hilton Kuala Lumpur's convention rooms, scanning the airwaves for spies.

In the salons above him, merchants of electronic interception demonstrate their gear to government agents who have descended on the Malaysian capital in early December for the Wiretapper's Ball, as this surveillance industry trade show is called.

As he tries to detect hacker threats lurking in the wireless networks, the man who helps manage a Southeast Asian country's Internet security says there's reason for paranoia. The wares on offer include products that secretly access your Web cam, turn your cell phone into a location-tracking device, recognize your voice, mine your e-mail for anti-government sentiment and listen to supposedly secure Skype calls.