Jun 01 2006
What They Look For
That whole NSA spying thing? Here’s an idea of how they do it from USA Today.
The “call detail records” are the electronic information that is logged automatically each time a call is initiated. For more than 20 years, local and long-distance companies have used call detail records to figure out how much to charge each other for handling calls and to determine problems with equipment.
In addition to the number from which a call is made, the detail records are packed with information. Also included: the number called; the route a call took to reach its final destination; the time, date and place where a call started and ended; and the duration of the call. The records also note whether the call was placed from a cellphone or from a traditional “land line.”
“They see everything,” says Sergio Nirenberg, director of systems engineering at Science Applications International Corp., a Fortune 500 research and engineering company that works with the federal government. Nirenberg said he does not have direct knowledge of the NSA database.
The disclosure of the call record database has raised concerns among lawmakers, such as Sen. Ron Wyden, D-Ore., that the records give the government access to information about innocent Americans. President Bush has insisted that intelligence efforts are only “focused on links to al-Qaeda and their known affiliates.”
The intelligence officials offered new insight into one way the database of calls is used to track terrorism suspects.
The officials, two current U.S. intelligence officials familiar with the program and two former U.S. intelligence officials, agreed to talk on condition of anonymity. The White House and the NSA refused to discuss the template or the program.
Using computer programs, the NSA searches through the database looking for suspicious calling patterns, the officials say. Because of the size of the database, virtually all the analysis is done by computer.
Calls coming into the country from Pakistan, Afghanistan or the Middle East, for example, are flagged by NSA computers if they are followed by a flood of calls from the number that received the call to other U.S. numbers.
The spy agency then checks the numbers against databases of phone numbers linked to terrorism, the officials say. Those include numbers found during searches of computers or cellphones that belonged to terrorists.
It is not clear how much terrorist activity, if any, the data collection has helped to find.
Not every call record contains the same level of detail. Depending upon how a business has its phone system set up, the call detail records might not register complete information on an outgoing call, Nirenberg says.
The records might note only the general number of the business, not the desk extension or, in the case of a hotel, the room extension. Incoming calls that don’t go through the switchboard and are dialed directly would have complete call detail records, Nirenberg says.
Not all local calls generate a call detail record, Nirenberg says. But that’s not to say that phone companies can’t create a record for local calls.
I don’t know about you, but I feel safer already!
