The price tag for safeguarding government secrets rose by 12 percent in 2011 to a record $11.4 billion.
The year-to-year estimate covers 41 executive branch agencies, but it excludes money spent by the CIA and five other intelligence agencies, where the amounts of money used to protect secrets are substantial but classified.
In a report to President Barack Obama, the Information Security Oversight Office said the amount spent on protecting secrets has grown more than four-fold since 1995, when it stood at $2.7 billion. A decade ago, the amount spent was $5.7 billion, half of last year's figure.
The oversight office provided no explanation for last year's substantial increase in costs.
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