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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. Brian Smith‏ @BRIAN_____ Oct 30

      Brian Smith Retweeted kennyog

      Nice! Been waiting for a paper like this since I removed the primality-testing code from *ring* ( https://github.com/briansmith/ring/commit/35d5a43f1b26d2636c66fd9b52f97b31428b0605 …). I hope to add RSA keygen back soon. Regardless, if your code is testing potentially-malicious inputs for primality something is fundamentally wrong.https://twitter.com/kennyog/status/1057352372077449216 …

      Brian Smith added,

      kennyog @kennyog
      Phew, CVE-2018-4398 is finally out - flaws in Apple's primality testing code in their CoreCrypto library, affecting multiple products and OSes. See Sections 1.3 and 4.8 of our updated paper at: https://eprint.iacr.org/2018/749 , cc @Massicrypt @martinralbrecht @jurajsomorovsky
      1 reply 2 retweets 12 likes
    2. Colm MacCárthaigh‏ @colmmacc Oct 30
      Replying to @BRIAN_____

      Are you saying that it's dumb for DH because the attacker could just do static-DH anyway? Or because a simple dh_check()-like test is what you should do?

      1 reply 0 retweets 0 likes
      Brian Smith‏ @BRIAN_____ Oct 30
      Replying to @colmmacc

      If the acceptance of an malicious prime is somehow part of an attack one has to defend against, why would one use a probabilistic algorithm instead of primality proving? Presumably perf + complexity. But probabilistic mechanisms are also terrible by those measures too.

      1:38 PM - 30 Oct 2018
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Brian Smith‏ @BRIAN_____ Oct 30
          Replying to @BRIAN_____ @colmmacc

          If you let the peer choose a critical security parameter then you must trust them, which means you must have authenticated them and then authorized them to choose it. You otherwise trust them enough to send/receive the data as long as as number is probably prime? Better get help.

          1 reply 0 retweets 0 likes
        3. Zeev Tarantov‏ @ZTarantov Oct 30
          Replying to @BRIAN_____ @colmmacc

          So if someone can surreptitiously switch the dh_param.pem file used by nginx for DHE so they can break DHE to passively eavesdrop and not get caught (stealing key for cert and MiTM is more likely to get caught), what's the defense?

          1 reply 0 retweets 0 likes
        4. Colm MacCárthaigh‏ @colmmacc Oct 30
          Replying to @ZTarantov @BRIAN_____

          What's to stop that same someone from just using static DH parameters and stashing the secret ones? even if they are prime!

          1 reply 0 retweets 0 likes
        5. Zeev Tarantov‏ @ZTarantov Oct 30
          Replying to @colmmacc @BRIAN_____

          It is visible from outside whether the DH parameters are static / reused, and exfiltrating the secret half of every handshake's DH parameter is a lot of traffic.

          0 replies 0 retweets 0 likes
        6. End of conversation

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