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Cross-site request forgery is an attack in which the user's current session to a secured web site is used to launch commands on that site without the user's involvement. One way to protect against CSRF is to...
Use a nonce.
Issue a new session ID at login.
Require two factor authentication.
Unfix the web site's communications.
A nonce is a unique value issued with each new page and echoed back with the users response. If commands arriving from the user do not contain the users current nonce, the commands can be rejected and other action taken to protect the site.
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