Tracking Patterns in Database of Millions of Calls

Tracking and analyzing domestic phone calls would require pattern-recognition software and intense traffic analysis, two of the newest tools in the intelligence trade.

Steven M. Bellovin, computer science professor at Columbia University, says the National Security Agency would have to use such techniques to analyze the huge databases turned over to the NSA by phone companies.

Robert Siegel talks with Bellovin about the agency's efforts.

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