From: xentrac@cybele.unm.edu (Kragen J. Sittler)
Date: Tue, 19 Jul 94 01:37:30 PDT
To: klbarrus@owlnet.rice.edu (Karl Lui Barrus)
Subject: Re: Card Playing Protocol
In-Reply-To: <9407182303.AA03222@flammulated.owlnet.rice.edu>
Message-ID: <9407190837.AA15374@cybele.unm.edu>
MIME-Version: 1.0
Content-Type: text


Karl Lui Barrus:
> The house shuffles, bit commits to the shuffle, and sends you the
> hash.  Then, you can begin playing, or you can try to break the system
> by finding a deck with a matching hash.  After you are done, the
> casino sends you the deck and you can verify that you weren't cheated.
> 
> All sorts of other stuff can be added later, like digital cash, etc.

Salting the deck before hashing it could prevent the above attack.
Hopefully not too many people will suggest this on the list. :)

Kragen