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IG officials agreed that the department had continued to “to improve and strengthen its information security program,” and had started to address issues raised in the most recent report.

Sen. Thomas R. Carper, Delaware Democrat and chairman of the homeland security committee, said the report “highlighted some very important areas in which DHS, like many other federal agencies, can and should improve.”

In November, the President’s Council of Advisors on Science and Technology released a report that found “the federal government rarely follows accepted best practices” when it comes to cybersecurity.

Some government computers are still using Windows XP as an operating system, the report found. The program is 12 years old and Windows announced that the company will stop supporting it next year. The president’s council wants all federal computers upgraded to more current software within two years.

Mr. Coburn said it was “inexcusable” for the government to waste billions of taxpayer dollars on IT improvements with little to show for it.

“The fact is the federal government’s classified and unclassified networks are dangerously insecure, putting at risk not only U.S. national security, but the nation’s critical infrastructure and vast amounts of our citizens’ personally identifiable information,” he said.