[tor-bugs] #2653 [Tor Client]: Support more stable guards for live CDs

Tor Bug Tracker & Wiki torproject-admin at torproject.org
Fri Mar 4 07:31:05 UTC 2011


#2653: Support more stable guards for live CDs
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 Reporter:  nickm        |          Owner:                  
     Type:  enhancement  |         Status:  new             
 Priority:  normal       |      Milestone:  Tor: unspecified
Component:  Tor Client   |        Version:                  
 Keywords:               |         Parent:                  
   Points:               |   Actualpoints:                  
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Comment(by rransom):

 Replying to [comment:2 nickm]:
 > Hm.  An extra track on the livecd, full of random bits, would be a great
 way to do a seed.  I'm not sure how to best do that, though.

 CPRM?  No, they'll never let us use that for anything useful.

 I don't think we can use an extra track, either -- most VMs (which need
 extra persistent entropy the most) won't support it, and live-CD
 developers would need to ship a customized CD-burning tool for each
 platform their users might download the CD with in order to create the CDs
 on bare metal.

 It's easiest to create a 'personalized CD' by clobbering a designated
 2048-byte sector of the ISO with random bits after downloading it, and
 interpreting the all-zero value in the original (as-downloaded) ISO as an
 instruction to extract entropy from the host system's hardware.

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/2653#comment:3>
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