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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. Tony Arcieri‏ @bascule 12 May 2015

      @sleevi_ if ClientHello contains supported hash functions, can't servers send back variadic chains based on what the client supports?

      1 reply 0 retweets 0 likes
    2. Ryan Sleevi‏ @sleevi_ 12 May 2015
      Replying to @bascule

      @bascule Yup, for leaves. Doesn't help for cross-signing though, depending on how the CA did their PKI.

      2 replies 0 retweets 0 likes
    3. Tony Arcieri‏ @bascule 12 May 2015
      Replying to @sleevi_

      @sleevi_ so ideally, instead of "chains", there would be a DAG of certificates?

      1 reply 0 retweets 0 likes
    4. Ryan Sleevi‏ @sleevi_ 12 May 2015
      Replying to @bascule

      @bascule Ideally? No. But permitted, yes. For example, only way to get old Android + new Firefox to work reliably for a site independently.

      4 replies 0 retweets 0 likes
      Brian Smith‏ @BRIAN_____ 12 May 2015
      Replying to @sleevi_

      @sleevi_ @bascule I don't think it is the "only" or best way, if you can use multiple different roots & choose chain based on ClientHello.

      7:25 PM - 12 May 2015
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Ryan Sleevi‏ @sleevi_ 12 May 2015
          Replying to @BRIAN_____

          @BRIAN_____ @bascule Like most technical tweets, I don't follow.

          1 reply 0 retweets 0 likes
        3. Brian Smith‏ @BRIAN_____ 12 May 2015
          Replying to @sleevi_

          @sleevi_ @bascule Server can check if the ClientHello looks like old Android or new Fx & choose between 2 very different chains accordingly.

          1 reply 0 retweets 0 likes
        4. Ryan Sleevi‏ @sleevi_ 12 May 2015
          Replying to @BRIAN_____

          @BRIAN_____ @bascule Yes, that's sometimes possible, but that system doesn't scale at all and is even flakier than cert blobs

          2 replies 0 retweets 0 likes
        5. Brian Smith‏ @BRIAN_____ 12 May 2015
          Replying to @sleevi_

          @sleevi_ @bascule It seems like one can get far with a 1 old/bad chain and 1 new/good chain. Agree it's not the easiest thing to get right.

          0 replies 0 retweets 0 likes
        6. End of conversation

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