Re: hardware RNG

On Mon, Sep 09, 2013 at 04:32:35PM -0300, Juan Garofalo wrote:

Wouldn't it be possible to build a RNG using something like a zener diode and a $2 microcontroller?

I would use a cheap analog circuit like http://www.maximintegrated.com/app-notes/index.mvp/id/3469 and let your audio card to A/D. Bonus points: there are already entropy gathering daemons which use soundcard input. Even cheaper: hang a cheap microphone into a fan exhaust. Noise definitely not white, but certainly more entropy than just looking at lowest bits of A/D.