July 8 — Sean Gorman’s professor called his dissertation “tedious and unimportant.” Gorman didn’t talk about it when he went on dates because “it was so boring they’d start staring up at the ceiling.” But since the Sept. 11, 2001, attacks, Gorman’s work has become so compelling that companies want to seize it, government officials want to suppress it, and al Qaeda operatives — if they could get their hands on it — would find a terrorist treasure map.

TINKERING ON a laptop, wearing a rumpled T-shirt and a soul patch goatee, this George Mason University graduate student has mapped every business and industrial sector in the American economy, layering on top the fiber-optic network that connects them.

He can click on a bank in Manhattan and see who has communication lines running into it and where. He can zoom in on Baltimore and find the choke point for trucking warehouses. He can drill into a cable trench between Kansas and Colorado and determine how to create the most havoc with a hedge clipper. Using mathematical formulas, he probes for critical links, trying to answer the question: “If I were Osama bin Laden, where would I want to attack?” In the background, he plays the Beastie Boys.

For this, Gorman has become part of an expanding field of researchers whose work is coming under scrutiny for national security reasons. His story illustrates new ripples in the old tension between an open society and a secure society.

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“I’m this grad student,” said Gorman, 29, amazed by his transformation from geek to cybercommando. “Never in my wildest dreams would I have imagined I’d be briefing government officials and private-sector CEOs.”

Invariably, he said, they suggest his work be classified. “Classify my dissertation? Crap. Does this mean I have to redo my Ph. D?” he said. “They’re worried about national security. I’m worried about getting my degree.” For academics, there always has been the imperative to publish or perish. In Gorman’s case, there’s a new concern: publish and perish.

“He should turn it in to his professor, get his grade — and then they both should burn it,” said Richard Clarke, who until recently was the White House cyberterrorism chief. “The fiber-optic network is our country’s nervous system.” Every fiber, thin as a hair, carries the impulses responsible for Internet traffic, telephones, cell phones, military communications, bank transfers, air traffic control, signals to the power grids and water systems, among other things. “You don’t want to give terrorists a road map to blow that up,” he said. The Washington Post has agreed not to print the results of Gorman’s research, at the insistence of GMU. Some argue that the critical targets should be publicized, because it would force the government and industry to protect them. “It’s a tricky balance,” said Michael Vatis, founder and first director of the National Infrastructure Protection Center. Vatis noted the dangerous time gap between exposing the weaknesses and patching them: “But I don’t think security through obscurity is a winning strategy.”

Gorman compiled his mega-map using publicly available material he found on the Internet. None of it was classified. His interest in maps evolved from his childhood, he said, because he “grew up all over the place.” Hunched in the back seat of the family car, he would puzzle over maps, trying to figure out where they should turn. Five years ago, he began work on a master’s degree in geography. His original intention was to map the physical infrastructure of the Internet, to see who was connected, who was not, and to measure its economic impact.

“We just had this research idea, and thought, ‘Okay,’ ” said his research partner, Laurie Schintler, an assistant professor at GMU. “I wasn’t even thinking about implications.” The implications, however, in the post-Sept. 11 world, were enough to knock the wind out of John M. Derrick Jr., chairman of the board of Pepco Holdings Inc., which provides power to 1.8 million customers. When a reporter showed him sample pages of Gorman’s findings, he exhaled sharply.

“This is why CEOs of major power companies don’t sleep well these days,” Derrick said, flattening the pages with his fist. “Why in the world have we been so stupid as a country to have all this information in the public domain? Does that openness still make sense? It sure as hell doesn’t to me.” Recently, Derrick received an e-mail from an atlas company offering to sell him a color-coded map of the United States with all the electric power generation and transmission systems. He hit the reply button on his e-mail and typed: “With friends like you, we don’t need any enemies in the world.”