nanog mailing list archives
Re: best way to create entropy?
From: shawn wilson <ag4ve.us () gmail com>
Date: Fri, 12 Oct 2012 00:48:05 +0000
On Fri, Oct 12, 2012 at 12:25 AM, Jonathan Lassoff <jof () thejof com> wrote:
On Thu, Oct 11, 2012 at 5:20 PM, Jimmy Hess <mysidia () gmail com> wrote:On 10/11/12, shawn wilson <ag4ve.us () 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 areYou are referring to the entropy pool used for /dev/random and crypto operations ? You could setup a video capture card or radio tuner card, tune it into a good noise source, and arrange for the bit stream to get written to /dev/randomYes, but then you're also introducing a way for an external attacker to transmit data that can be mixed into your entropy pool. While certainly a cool hack, I don't think anything like this would be safe for cryptographic use.
which i guess means my tcpdump is also a bad idea... i've heard of looking at radio, voltage, and video. i was really wondering about a good every day solution - something easily implemented on any computer. so maybe a way of getting random network traffic or something random from computers around you. i'm not verisign or any other type of company that needs to generate thousands of keys in a day, but sometimes i need to generate a half dozen or so, and my entropy runs out pretty quickly. the radio idea might work for me if i could get a wire and a cheap amplifier and plug it into a headphone jack or possibly figure out a ccd type thing on a motor that would give me noise for my sound card. but i was hoping for something even more simple than that - maybe wifi noise?
Current thread:
- Re: best way to create entropy?, (continued)
- Re: best way to create entropy? Jasper Wallace (Oct 13)
- Re: best way to create entropy? shawn wilson (Oct 13)
- Re: best way to create entropy? Sander Steffann (Oct 14)
- Re: best way to create entropy? Aaron Toponce (Oct 16)
- Re: best way to create entropy? shawn wilson (Oct 11)
- Re: best way to create entropy? Andy Smith (Oct 12)
- Re: best way to create entropy? Jonathan Lassoff (Oct 11)
- Re: best way to create entropy? Jussi Peltola (Oct 11)
- Re: best way to create entropy? shawn wilson (Oct 11)
- Re: best way to create entropy? Jimmy Hess (Oct 11)
- Re: best way to create entropy? Valdis . Kletnieks (Oct 11)
- Re: best way to create entropy? Jimmy Hess (Oct 16)
- Re: best way to create entropy? JC Dill (Oct 18)