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Re: IDL random number generator [message #35149 is a reply to message #35076]

Mon, 19 May 2003 16:51

condor
Messages: 35
Registered: January 2002

Member

David Fanning <david@dfanning.com> wrote in message news:<MPG.192c7f24abbae652989b96@news.frii.com>...
> Folks,
>
> You guys might want to check out this Quantum Random
> Number Generator. This one takes a LONG time to repeat! :-)
>
> http://www.idquantique.com/qrng.html
>
> Cheers,
>
> David

I would mistrust this for the following reasons.

The website states:

> Being deterministic devices, computers are not capable of producing random
> number generators.

That statement is false: any odd soundcard has a noise-generator
(essentially a glorified resistor with a big amplifier attached to it)
that is capable of producing perfectly fine thermal random noise. I've
used that for creating random numbers since back in the days of the
Atari-800 (OK, so I'm dating myself here).

Even if a piece of external hardware was desirable for this process it
could be cobbled together for $5 from a couple resistors, an opAmp for
amplification and an RC high-pass filter (to get rid of slow drifting
in the opAmp). Potentially another opAmp driven open-loop as a
Schmitt-trigger. Gives you clock-free(!) bit-noise.

Anybody who tries to sell a quantum-ANYTHING to make noise(!!) is
direputable from the word 'go' in my eyes.

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[Message index]

		IDL random number generator By: krijger on Fri, 09 May 2003 04:47
		Re: IDL random number generator By: David Fanning on Wed, 14 May 2003 16:28
		Re: IDL random number generator By: condor on Mon, 19 May 2003 16:51
		Re: IDL random number generator By: rmoss4 on Thu, 15 May 2003 08:19
		Re: IDL random number generator By: jeyadev on Tue, 13 May 2003 11:54
		Re: IDL random number generator By: tandp on Tue, 20 May 2003 19:54
		Re: IDL random number generator By: James Kuyper on Tue, 20 May 2003 07:30
		Re: IDL random number generator By: rmoss4 on Mon, 19 May 2003 21:18

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