Signing keys on a low-entropy system

Johannes Zarl johannes at
Fri Nov 8 14:17:53 CET 2013

The hardware-RNG somehow slipped under my radar. Thanks for pointing that out.

Out of curiosity: how does GnuPG deal with a system where entropy is scarce 
(or worse yet, where the RNG is partly predictable)?


On Friday 08 November 2013 08:31:09 René Puls wrote:
> Hi,
> On Fri, 08 Nov 2013 00:11:38 +0100 Johannes Zarl <johannes at>
> wrote:
> > I'm currently thinking about using a raspberry pi as a non-networked
> > stand- alone system for signing keys. Since I haven't heard anything
> > to the contrary, I'm pretty sure that entropy is relatively scarce on
> > the pi.
> The Raspberry Pi has a hardware RNG that is supported by rng-tools,
> which is more than most desktop PCs have:
> -hardware-random-number-generator/
> Not sure about its quality though...
> René

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