[Cryptography] Generate Random Data From Sound Card

[Peter Gutmann]

Jon Callas <jon at callas.org> writes:

>Same principle as the camera with a lens cap on. 

Cameras (proper ones, not cellphones) already take advantage of this in dark-
frame subtraction, with long exposures or high ISO shots they take images with
the shutter closed to capture sensor noise and then subtract that from the
actual image.

Peter.