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Great explanation, hacker!

I would like to add few considerations to what you said.

  • hidden fields make impossible to cache generated pages;
  • hidden fields can hold different session_ids for different instances of the same browser, and this can be useful sometimes;
  • this is impossible using cookies;
  • your way to generate session ids can be improved using the code coming right from the Eagle Book:
    use MD5 (); $MAC = MD5->hexhash($secret . MD5->hexhash(join '', $secret, @fields));

    Now you also have a secret string, not predictable by the client, and double md5, to prevent dirty tricks over digested string. There is a nice introduction about this at page 213 of the Eagle Book.

Ciao, Valerio


In reply to Re: Re: Secure Session Management by valdez
in thread Secure Session Management by glickjd

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