From Newsgroup: sci.crypt

Try one command to convert the sound card into a TRNG.

It should work with the audio muted.

arecord -D plughw -f S32_LE -t wav -c2 -r 44100 \
| xxd -p -c 0 | fold -w 8 | cut -c 5-6 | tr -d '\n' \
| fold -w 63 | head -n 320 | tail -n 20

This harvests the low-order noise bits and discards the silent bits.

The remainder is electronic noise from the sound card.

The user may need to specify the sound card with:

```-D plughw:A,B```

where A is the card number and B is the device number obtained via 'arecord -l'.
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