Re: VMPC Stream Cipher - ideas on potential weaknesses?

From: Sebastian Gottschalk (seppi_at_seppig.de)
Date: 02/27/04 

Date: Fri, 27 Feb 2004 21:13:39 +0100

Seems like you don't understand it:

1. You come here with a new method which is not that new at all, which is
slower and comsumes more memroy than long-proven methods, and you can't
even proof simplest things about it's security? Go get figure...

2. As they have shown the +1-step is can be rewritten as addition
recursion, so can the mod 256 be. VMCP(x)=P(P(P(x))+1)%256 is just
VCMP(x)=M(R(P(P(P(x))))), and the latter design has been proven to weak no
matter how many recursions are involved.

3. Therefore it would only be a simple matter of time to implement the
attack. For at point 1 we know that you can't be really serious, therefore,
not doubt in you fairness, we don't except you paying the 100$ for
sucessfully showing that the proof is correct. Therefore it would just be a
waste of time. 

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