The National Security Agency’s Internet site has been placing files on visitors’ computers that can track their Web surfing activity despite strict federal rules banning most of them.

These files, known as “cookies,” disappeared after a privacy activist complained and The Associated Press made inquiries this week, and agency officials acknowledged Wednesday they had made a mistake.

Fast Fact
The government first issued strict rules on cookies in 2000 after disclosures that the White House drug policy office had used the technology to track computer users viewing its online anti-drug advertising.

Nonetheless, the issue raises questions about privacy at a spy agency already on the defensive amid reports of a secretive eavesdropping program in the United States.

“Considering the surveillance power the NSA has, cookies are not exactly a major concern,” said Ari Schwartz, associate director at the Center for Democracy and Technology, a privacy advocacy group in Washington, D.C. “But it does show a general lack of understanding about privacy rules when they are not even following the government’s very basic rules for Web privacy.”

Until Tuesday, the NSA site created two cookie files that do not expire until 2035 — likely beyond the life of any computer in use today.

Don Weber, an NSA spokesman, said in a statement Wednesday that the cookie use resulted from a recent software upgrade. Normally, the site uses temporary, permissible cookies that are automatically deleted when users close their Web browsers, he said, but the software in use shipped with persistent cookies already on.

To read more visit CBS site.