From: "Theodore Y. Ts'o" <tytso@mit.edu>
Subject: Re: [PATCH] random: addu a config option to trust the CPU's hwrng
Date: Thu, 19 Jul 2018 10:21:48 -0400
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On Wed, Jul 18, 2018 at 04:22:35PM -0400, Sandy Harris wrote:
> 
> Yes & one of those can also solve any difficulty with random(4) at
> startup. Another alternative, perhaps easier on some systems, is
> Denker's Turbid trng:
> https://www.av8n.com/turbid/paper/turbid.htm

In the link above I saw breadboards with resistors plugged in,
alligator clips to TRG plugs, shield boxes with aluminum foil, and
doing calibrations using voltmeters.  While that induced a pleasant
flashback to my junior high days when I experimented with electronics,
I'm not entirely sure most sysadmins would call that "easy".  :-)

    		      	   	     	   	- Ted