| Inside DCSNet, the FBI’s Nationwide Eavesdropping Network
By Ryan Singel
WiReD
08.29.07 | 2:00 AM
FBI wiretapping rooms in field offices and undercover locations around the country are connected through a private, encrypted backbone that is separated from the internet. Sprint runs it on the government’s behalf.
The network allows an FBI agent in New York, for example, to remotely set up a wiretap on a cell phone based in Sacramento, California, and immediately learn the phone’s location, then begin receiving conversations, text messages and voicemail pass codes in New York. With a few keystrokes, the agent can route the recordings to language specialists for translation.
The numbers dialed are automatically sent to FBI analysts trained to interpret phone-call patterns, and are transferred nightly, by external storage devices, to the bureau’s Telephone Application Database, where they’re subjected to a type of data mining called link analysis.
FBI endpoints on DCSNet have swelled over the years, from 20 “central monitoring plants” at the program’s inception, to 57 in 2005, according to undated pages in the released documents. By 2002, those endpoints connected to more than 350 switches.
Today, most carriers maintain their own central hub, called a “mediation switch,” that’s networked to all the individual switches owned by that carrier, according to the FBI. The FBI’s DCS software links to those mediation switches over the internet, likely using an encrypted VPN. Some carriers run the mediation switch themselves, while others pay companies like VeriSign to handle the whole wiretapping process for them.
The numerical scope of DCSNet surveillance is still guarded. But we do know that as telecoms have become more wiretap-friendly, the number of criminal wiretaps alone has climbed from 1,150 in 1996 to 1,839 in 2006. That’s a 60 percent jump. And in 2005, 92 percent of those criminal wiretaps targeted cell phones, according to a report published last year. |