generating noisy samples at a high rate with RTLSDR

Eugen Leitl eugen at leitl.org
Tue Sep 10 09:55:46 PDT 2013


On Tue, Sep 10, 2013 at 06:47:28PM +0200, Jens Christian Hillerup wrote:
> On Tue, Sep 10, 2013 at 6:15 PM, Eugen Leitl <eugen at leitl.org> wrote:
> 
> > Just remembered another cheap option for generating a lot
> > of noisy samples: http://sdr.osmocom.org/trac/wiki/rtl-sd<http://sdr.osmocom.org/trac/wiki/rtl-sdr>
> 
> 
> Isn't RTLSDR only for *reading* signals?

That's exactly what you need, if you want to get entropy
from the real world. Wide-band white noise generator 
circuits up to 300 MHz are very cheap and easy.

This gives you some 1.4 Msamples @ 8 bit. With a wideband
white noise source there will be several bits of entropy
in each sample, estimated.
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