Why can CSRF attack be prevented by a random CSRF secret?

Posted by user261527 on Stack Overflow See other posts from Stack Overflow or by user261527
Published on 2010-01-29T04:05:08Z Indexed on 2010/06/06 13:02 UTC
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csrf

to prevent CSRF attacks, a random CSRF secret has been generated.

The above is from symfony: http://www.symfony-project.org/getting-started/1_4/en/04-Project-Setup

Since it's finally operated by users,which is so called deputy attack.how can it work by setting that secret?

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