Given that no one has mentioned it yet, encrypting information and sending it back to the browser is generally considered bad form. (I'm making the assumption here that your not using said information as a sess_id).

The reason it is generally considered bad form is you have no control over the data:

  1. Consider a replay attack. Someone gets the encrypted information stores it for a while and sends it back.
  2. Consider a crack of the cypher. Someone determines the plaintext, modifies it and sends it back (not to mention your entire application is now exposed).
  3. Consider a corruption. Someone arbitrarily changes some bytes and sends it back. It may decrypt and crash (or worse!) your application.

For these reasons (and others) the safest method of managing state, is by sending a non determinate token to the browser as a cookie (or in a url), then retrieving the token and looking up the associated details.

You now have complete control over when, where, how and the manipulation of the data.

In reply to Re: Length of Crypt::CBC result by Ryszard
in thread Length of Crypt::CBC result by talexb

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