Pakistan has accepted some security training from the CIA, but U.S. export restrictions and Pakistani suspicions have prevented the two countries from sharing the most sophisticated technology for safeguarding nuclear components.

Stuxnet, a computer worm reportedly developed by the United States and Israel that destroyed Iranian nuclear centrifuges in attacks in 2009 and 2010, is often cited as the most dramatic use of a cyber weapon.

U.S. surveillance of Pakistan extends far beyond its nuclear program. There are several references in the black budget to expanding U.S. scrutiny of chemical and biological laboratories.

Barton Gellman Quotes