Re: ANNOUNCE: Leopard10 CSPRNG

From: Tim Goodwin (tjg@star.le.ac.uk)
Date: 03/27/03

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    From: Tim Goodwin <tjg@star.le.ac.uk>
Date: 27 Mar 2003 16:43:03 +0000

    ggr@qualcomm.com (Gregory G Rose) writes:

    > Mrsjunecarey <mrsjunecarey@aol.com> wrote:
    > >(b) As far as I can tell there's no way to deduce the internal state from any
    > >amount of its results. I tried to improve every aspect of the ARC4 design
    > >including its security (or lack thereof).
    >
    > There's a different fallacy here.
    > premise: Robin can't deduce the internal state.
    > premise: If it's secure, no-one can deduce the internal state
    > conclusion: therefore it's secure
    >
    > This argument is incorrect. (I think it's the
    > fallacy of the undistributed middle.)

    No. Your recasting of the argument makes it very clear that the
    fallacy is affirming the consequent.

    Tim. 

    -- 
Tim Goodwin   | "But fixing the entire UNIX system is not
Leicester, UK | on my TODO list. (Yet.)" -- Dan Bernstein
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