| Readme: | Short: AHIRNG - Random Number Generator via AHI
Author: Rupert Hausberger <natmeg@gmx.net>
Uploader: Rupert Hausberger <natmeg gmx net>
Type: util/misc
Version: 1.2
Architecture: ppc-morphos
Description
===========
AHIRNG (Audio Hardware Interface Random Number Generator) is a tool to
generate REAL random number from a soundcard.
Requirements
============
- MorphOS 1.x
- NList classes
- AHI 4.x
- 44khz/16bit soundcard
- Analoge noise source
Installation
============
Installation is very simple.
Just drag the AHIRNG-drawer where you like, it does not need assigns.
Usage
=====
Connect your Pegasos-onboard/Soundcard line-in to a analoge radio/SAT receiver.
Remove the areal from the receiver so you only hear the pink-noise. This is our
source for the random numbers.
Now start the tool and press 'Monitor'. Adjust the input-gain to about ~90%.
Watch the gauges, they should be around ~(+-)25.000 to (+-)30.000.
Now select the output file, press 'Record' and see the random bytes comming...
If the needed amount of random-bytes has been recorded press 'Stop'. Now press
"Analyse output file" to check the quality. Quality should be at least 'High' in
all five tests for randomness...
Technical
---------
Sampling is done at 44khz in 16bit. This means we got a raw-stream of
44000 * 2 * 2 bytes/s (44000hz * 2 bytes (16bits) * 2 channels) = 176.000 bytes/s
Next step is to convert this stream into quality random numbers. This is done
with the following function:
for (i = 0; i < 44000; i++) //for every second
{
UWORD l = ((((ULONG *)rawdata)[i] >> 16) & 0xffff); //extract left channel
UWORD r = (((ULONG *)rawdata)[43999 - i] & 0xffff); //extract right channel and invert
rnddata[i] = (l - r) & 0xff; //substract the inverted left channel from the right
}
ToolTypes
---------
TOOLPRI/K/N - Set to toolpri from -127 to 127, defaults to 0
Author
======
�2005-2012 Rupert Hausberger <natmeg@gmx.net>
http://natmeg.mooo.com/
Copyrights
==========
NList : �2001-2012 NList Open Source Team
http://www.sourceforge.net/projects/nlist-classes/
License
=======
GPL. Please refer to the file COPYING for details.
History
=======
Please refer to the file ChangeLog for details.
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Ambient (148)
AHIRNG_1.2.lha
