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Got an international e-mail pen pal or chat buddy? Belong to a mailing list that includes one person from outside the United States? Use a cell phone much? If you do, odds are good that Big Brother is watching you.

According to intelligence experts in the United States and Europe, a massive electronic intercept program called Project Echelon scans all Internet traffic, cell phone conversations, faxes, and long-distance telephone calls--virtually every type of electronic communication--looking for evidence of terrorist activity, military threats, and transnational crime.

The e-spying is being conducted by the secretive U.S. National Security Agency and its counterparts in Australia, Canada, New Zealand, and the United Kingdom.

"They are looking for thugs and drugs," says John Pike, expert on security and intelligence issues for the Federation of American Scientists.

That pursuit may be worthwhile in theory, but most of what the spooks are scanning comes from you and me, not from terrorists, criminals, or other menaces to society.

How the Spies Work

Echelon uses a filtering process to flag messages with keywords such as bomb, gun, and militia. But because little is known about Echelon, it remains unclear whether the system can differentiate between messages sent by criminals and those sent by law-abiding citizens. For example, a person in Chicago might innocently use two or more of the keywords in an e-mail to a friend in Japan while describing a Tom Clancy novel, or while discussing the latest NYPD Blue episode, or even a news report about a recent terrorist act. What happens when Echelon picks up such a message? No one knows.

If you're a typical user, your chances of coming to the attention of a live person at the NSA--much less of being placed under more thorough surveillance as part of an investigation--are tiny. But nevertheless, the NSA has cast a very wide net to catch just a few suspicious goldfish. And the agency is invading your privacy to do it.

Project Echelon's equipment can process 1 million message inputs every 30 minutes, according to a series of reports commissioned by the Scientific and Technological Options Assessment program, a research wing of the European Parliament.

The STOA studies finds the system filters intercepted material so minutely that only ten inputs out of 1 million are passed along for detailed analysis--which is likely a second level of software filtering. Even fewer messages reach live analysts.

The system also reportedly uses voiceprint technology to search telephone communications for targeted speakers.

Echelon uses powerful search engines--called dictionaries--to ferret out keywords of interest to intelligence analysts. Only a handful of these keywords from the classified dictionaries have made their way into published reports about the program.