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Re: Re: Encrypted Storage of sensible Data in a Cookie

by projekt21 (Friar)
on Oct 22, 2001 at 14:09 UTC ( #120485=note: print w/replies, xml ) Need Help??


in reply to Re: Encrypted Storage of sensible Data in a Cookie
in thread Encrypted Storage of sensible Data in a Cookie

But then I have to store the password plaintext on the server, right? This is not what I wanted.

But thanks for the hint, I just started reading that book and will hopefully gain some insights.

alex pleiner <alex@zeitform.de>
zeitform Internet Dienste

  • Comment on Re: Re: Encrypted Storage of sensible Data in a Cookie

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Re: Re: Re: Encrypted Storage of sensible Data in a Cookie
by davis (Vicar) on Oct 22, 2001 at 14:16 UTC
    Almost. You're not storing the users' passwords on the server, but the "secret key".

    Here's some actual (old) code:
    my $secret_key = "BLAHBLAHBLAH"; my $session_cookie = $query->cookie('SessionID'); umask 0066; if($session_cookie) { my $mac; if(($sessionid, $mac) = split("-", $session_cookie)) { ###Ok, the user has returned a cookie, ###let's make sure it's not been tampered with +. if($mac ne md5_hex($sessionid . md5_hex($sessi +onid.$secret_key))) { destroy_cookie($sessionid, "MODIFIED") +; ###Ack. Nasty people return; } else { ###Other checks. }
    This way you're not storing the password, you're just making sure the user doesn't modify the data. A reasonable golden rule is: "NEVER trust the data the user hands you".

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