An anonymous reader writes "A sophisticated FBI-produced spyware program has played a crucial behind-the-scenes role in federal investigations into extortion plots, terrorist threats and hacker attacks in cases stretching back at least seven years, according to newly declassified documents obtained by Wired.com. The so-called 'computer and internet protocol address verifier,' or CIPAV, is delivered through links to websites controlled by the FBI, and it silently reports back to a government server in Virginia. Among other cases, the FBI used it to track a Swedish hacker responsible for cracking thousands of computers at national labs and NASA's JPL in 2005."
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