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BRIAN_____'s profile
Brian Smith
Brian Smith
Brian Smith
@BRIAN_____

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Brian Smith

@BRIAN_____

Code farmer. Security, crypto, performance, networking, usability. Rust, C++, C, Haskell, DSLs, etc. *ring*, webpki, crypto-bench, mozilla::pkix.

Honolulu & San Francisco
briansmith.org
Joined April 2008

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    1. Nick Mathewson‏ @nickm_tor 10 Dec 2013

      There's a big difference between "We shouldn't assign 100% trust to any particular HWRNG" and "RDRAND IS TEH BACKDOOR!!!!11!"

      4 replies 16 retweets 5 likes
    2. Matthew Green‏ @matthew_d_green 10 Dec 2013
      Replying to @nickm_tor

      @nickm_tor RDRAND is teh backdoor.

      1 reply 1 retweet 1 like
    3. Nick Mathewson‏ @nickm_tor 10 Dec 2013
      Replying to @matthew_d_green

      @matthew_d_green I am less than sure of that. But any OS PRNG which can't withstand one of its inputs being teh backdoor is IMO quite poor.

      1 reply 2 retweets 1 like
    4. Matthew Green‏ @matthew_d_green 10 Dec 2013
      Replying to @nickm_tor

      @nickm_tor I agree, but let's be honest... A backdoor isn't aimed against smart software. It's aimed against software that's friendly to it.

      1 reply 0 retweets 0 likes
    5. Taylor Hornby‏ @DefuseSec 10 Dec 2013
      Replying to @matthew_d_green

      Taylor Hornby Retweeted Taylor Hornby

      @matthew_d_green @nickm_tor Yep, and the Linux kernel up to 3.13-rc? allows RDRAND to fully control the output -https://twitter.com/DefuseSec/status/408975222163795969 …

      Taylor Hornby added,

      Taylor Hornby @DefuseSec
      My RDRAND backdoor proof of concept is working! Stock kernel (3.8.13), only the RDRAND instruction is modified. pic.twitter.com/PVSdo5CZqK
      1 reply 1 retweet 2 likes
    6. Nick Mathewson‏ @nickm_tor 10 Dec 2013
      Replying to @DefuseSec

      @DefuseSec @matthew_d_green It might not be out of order to suspect everybody who's suggested using RDRAND to -replace- an entropy pool.

      4 replies 2 retweets 3 likes
    7. Matthew Green‏ @matthew_d_green 10 Dec 2013
      Replying to @nickm_tor

      @nickm_tor @DefuseSec Ya think? :)

      1 reply 0 retweets 0 likes
    8. Brian Smith‏ @BRIAN_____ 10 Dec 2013
      Replying to @matthew_d_green

      @matthew_d_green @nickm_tor @DefuseSec RDRAND-only seems like the best choice for VMs because it is atomic. Outside of a VM guest, then no.

      2 replies 0 retweets 0 likes
    9. Taylor Hornby‏ @DefuseSec 10 Dec 2013
      Replying to @BRIAN_____

      @BRIAN_____ @matthew_d_green @nickm_tor Is there a reason atomic is better in VMs? Side channel attack?

      1 reply 0 retweets 0 likes
    10. Brian Smith‏ @BRIAN_____ 10 Dec 2013
      Replying to @DefuseSec

      @DefuseSec @matthew_d_green @nickm_tor Result of discussion of cloning kernel PRNG state during VM cloning, but now I don't remember details

      2 replies 0 retweets 0 likes
      Brian Smith‏ @BRIAN_____ 10 Dec 2013

      @DefuseSec @matthew_d_green @nickm_tor It may very well have been the wrong conclusion. Something to think about.

      3:24 PM - 10 Dec 2013
      0 replies 0 retweets 0 likes

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