> > I posted code and results a while back to freebsd-arch which sampled the
> > sound card from userland and analysed the shannon entropy of the noise
> > (for the record, all but one card I tried gave about 6 bits of entropy or
> > more per 16 bit sample with no recording device plugged in, and maximum
> > input gain, and could be sampled 44000 times per second or more. The other
> > card driver was probably broken). Thats what I'm basing this on, but I
> > haven't tried to make a kernel harvester.
> Ok! Have you still got that code? Please either send it to me (personally)
> or send a reference. Some ideas about how to use [this type of source]
> in FreeBSD are also usefulp; It's easy to "steal" a sound card; to use a
> sound card as an entropy source is more of a problem; ideas welcome.
Yes, and I'd like to run the code over some more video frames captured
from the Bt848-based board. When tuned to an empty channel, there would
seem to be much noise to be had..
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