Ahhhh ok, I think i'm begining to understand. DES cant do this. Given a key and plaintext, DES will always produce the same ciphertext.

What I think you're after is session management.

The basic gist is:

  1. You have already a bunch of users
  2. The user logs in and you give them a token
  3. Each page refresh you check their token against a list of known tokens. If its in the list, let them view the page, otherwise direct them to log in again

The token can be an MD5 hash. The list of users can be in a database or in a flatfile, and you should have a sessions table (or ff) which would have the token and the user_id in it.

Each page view you get the token (from a CGI param or from a cookie) and look it up in your session table.

In reply to Re: Re: Re: Crypt::DES returns same string by Ryszard
in thread Crypt::DES returns same string by learn_forever

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