Re: [cryptography] best way to create entropy?

2012-10-12 Thread Eugen Leitl 
- Forwarded message from Naslund, Steve snasl...@medline.com -

From: Naslund, Steve snasl...@medline.com
Date: Thu, 11 Oct 2012 23:27:56 -0500
To: na...@nanog.org
Subject: RE: best way to create entropy?

I know that a popular method for generating random bit streams is to take radio 
(stellar) noise and convert it into a digital bit stream.  Very popular among 
crypto geeks.

Steven Naslund

-Original Message-
From: Dan White [mailto:dwh...@olp.net] 
Sent: Thursday, October 11, 2012 10:55 PM
To: Jonathan Lassoff
Cc: North American Network Operators Group
Subject: Re: best way to create entropy?

On 10/11/12 17:08 -0700, Jonathan Lassoff wrote:
On Thu, Oct 11, 2012 at 5:01 PM, shawn wilson ag4ve...@gmail.com wrote:
 in the past, i've done many different things to create entropy - 
 encode videos, watch youtube, tcpdump -vvv  /dev/null, compiled a 
 kernel. but, what is best? just whatever gets your cpu to peak or are 
 some tasks better than others?

Personally, I've used and recommend this USB stick: 
http://www.entropykey.co.uk/

Internally, it uses diodes that are reverse-biased just ever so close 
to the breakdown voltage such that they randomly flip state back and 
forth.

+1.

--
Dan White


- End forwarded message -
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Re: [cryptography] best way to create entropy?

2012-10-12 Thread Erwann Abalea 
Getting random out of spoofable radio signals? Good idea.

2012/10/12 Eugen Leitl eu...@leitl.org:
 - Forwarded message from Naslund, Steve snasl...@medline.com -

 From: Naslund, Steve snasl...@medline.com
 Date: Thu, 11 Oct 2012 23:27:56 -0500
 To: na...@nanog.org
 Subject: RE: best way to create entropy?

 I know that a popular method for generating random bit streams is to take 
 radio (stellar) noise and convert it into a digital bit stream.  Very popular 
 among crypto geeks.

-- 
Erwann.
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Re: [cryptography] best way to create entropy?

2012-10-12 Thread Sandy Harris 
There's a reasonable, if incomplete, discussion here:
http://en.citizendium.org/wiki/Random_number_generator#Random_sequences_from_physical_phenomena

Wikipedia also has an article. The standard reference is an IETF document
in the Best Current Practices series
http://www.ietf.org/rfc/rfc4086.txt
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