[cryptography] [FORGED] Re: Kernel space vs userspace RNG

The Doctor drwho at virtadpt.net
Thu May 19 13:35:16 EDT 2016


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On Thu, 19 May 2016 14:45:26 +0000
Peter Gutmann <pgut001 at cs.auckland.ac.nz> wrote:

> The counter you linked to looked like it was using a cheap M4011 tube
> (Chinese equivalent of the ubiquitous Russian SBM-20), which means it

Good eye!

> wouldn't detect alpha, only beta and gamma.  A reading of 15-30cpm is
> pretty high, presumably you're in an area with higher background radiation?

Reasonably so, yes.  Post-industrial neighborhood, very old house, somewhat
good view of the western sky.

> How long did you run it for?  Another issue is that keeping a pile of

My Geiger counter died after an uptime of around fourteen months of being
continuously powered on and feeding bits into a Python script on a spare
netbook.  The script detected the serial device suddenly disappearing and
died with an exception, which a watchdog script picked up and e-mailed to
me.  I haven't been able to resurrect it.

> components energised at 400-600V 24/7 probably isn't optimal in terms of
> both power consumption and component life.

It's USB powered so that wasn't really a big deal.  As for component life, it
undoubtedly burned parts of itself out.

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

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