Re: Good enough for crypto?

From: Mok-Kong Shen (mok-kong.shen_at_t-online.de)
Date: 12/02/03 

Date: Tue, 02 Dec 2003 08:40:19 +0100

Scott Wilber wrote:
>
[snip]
> The theorem relates specifically and only to non-deterministic
> sequences as is clearly stated. No inference may be made from this
> concerning deterministic generators.

While my math knowledge is poor, I rather doubt that,
starting from the concept of 'non-deterministic' and
independent of any assumptions from the side of physics,
you could establish a (purely) mathematical theorem on
the behaviour of ACF in the way you said. Isn't it that
a strictly theoretical white noise has zero ACF
excepting at the origin? So a practical one should
have some tiny values that are non-zero as it should be
due to statistical 'fluctuations'. I just don't yet see
in this (admittedly heuristic) sense why ACF 'has' to
vanish at sufficiently far distance from the origin.
Thanks.

M. K. Shen
-------------------------------
http://home.t-online.de/home/mok-kong.shen