"U.S. spy agencies mounted 231 offensive cyber-operations in 2011". The Washington Post. August 31, 2013
"Black Budget" of spy agencies" - The Washington Post.
"Of the 231 offensive operations conducted in 2011, the budget said, nearly three-quarters were against top-priority targets, which former officials say includes adversaries such as Iran, Russia, China and North Korea and activities such as nuclear proliferation".