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Someone I know was working on a problem like this, and used something along the lines of the tokens solution that you described. What they did is to use a user's unique user ID value, pass it through crypt(), and then embed that into their form as the token. That value would then be checked with the user ID inside the database, and if the two matched any other checks could then be run.

In reply to Re: Is your web application really secure? ("CSRF") by Spidy
in thread Is your web application really secure? ("CSRF") by tinita

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