Re: Strong PRNG with AES or 3-DES

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Mok-Kong Shen (mok-kong.shen@stud.uni-muenchen.de)
Tue, 11 Aug 1998 17:33:44 +0100


Perry E. Metzger wrote:
>
> Mok-Kong Shen writes:
> > Mark Tillotson wrote:
> > In general computing I suppose it is well-known that one can obtain
> > any statistical distribution (discrete or not) from a uniform
> > distribution in [0,1).
>
> I suppose it is not well known that the floating point numbers between
> 0 and 1 do not constitute a uniform distribution over the space [0,1),
> and that, in fact, the distribution has very bad properties. See any
> book on numerical analysis for a discussion of this.
>
> You are not, remember, dealing with reals. You are dealing with a bad
> approximation, "floating point" numbers.

If you are of the opinion that computer arithmetics are all bad
approximations, you are certainly absolutely right.

M. K. Shen


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