[cryptography] Kernel space vs userspace RNG

The Doctor drwho at virtadpt.net
Mon May 16 13:48:17 EDT 2016


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On Fri, 13 May 2016 14:31:45 -0400
Kevin <kevinsisco61784 at gmail.com> wrote:

> The truth is, entropy is only really interesting if you have the funds 
> to hook up a Geiger counter to your computer.

That's cheaper than you think:

https://nl.aliexpress.com/item/Free-Shipping-Assembled-DIY-Geiger-Counter-Kit-Nuclear-Radiation-Detector-GM-Tube/32336592385.html?isOrigTitle=true

It took me an afternoon to write some Python to measure the times in between
particles hitting the tube, hash them, and cat them into /dev/urandom.

On the other hand, then people start helpfully warning you about an attacker
aiming beams of gamma radiation at your giger counter to skew the RNG in a
predictable direction so your generated keys are easier to guess...

- -- 
The Doctor [412/724/301/703/415] [ZS]

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WWW: https://drwho.virtadpt.net/

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