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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. Jake Massimo‏ @Massicrypt Oct 30

      I wrote a blog post about our findings in Apple's CommonCrypto (and corecrypto) library https://www.massi.moe/blog/primality-testing-in-apple-core-crypto … with security update now live in macOS Mojave 10.14.1 and iOS 12.1 with @kennyog @martinralbrecht @jurajsomorovsky

      2 replies 54 retweets 107 likes
    2. Dan Kaminsky‏Verified account @dakami Oct 30
      Replying to @Massicrypt @kennyog and

      Neat! And great viz! Any tips what I can exploit, given *intentional* confusion of prime and composite? I can see the channel-less covert leak but I’ve got a few ways of doing that.

      1 reply 0 retweets 0 likes
    3. kennyog‏ @kennyog Oct 30
      Replying to @dakami @Massicrypt and

      PAKEs are a good target - attacker impersonates server to client, sends bad DH params, and learns client pwd by solving easy discrete log problem. This is due to Bleichenbacher (so it is necessarily good!)

      2 replies 1 retweet 6 likes
    4. Colm MacCárthaigh‏ @colmmacc Oct 30
      Replying to @kennyog @dakami and

      Is there a PAKE protocol where the params aren't covered by a signature?

      1 reply 0 retweets 0 likes
    5. kennyog‏ @kennyog Oct 30
      Replying to @colmmacc @dakami and

      All of them - the point of a PAKE is for both parties to authenticate and establish keys without any PKI, hence no sigs.

      2 replies 0 retweets 0 likes
    6. Brian Smith‏ @BRIAN_____ Oct 30
      Replying to @kennyog @colmmacc and

      Yes, but don't all real PAKEs insist on agreeing on parameters like this out of band, a priori?

      2 replies 0 retweets 1 like
    7. kennyog‏ @kennyog Oct 30
      Replying to @BRIAN_____ @colmmacc and

      Define "real PAKEs"!

      1 reply 0 retweets 1 like
    8. Brian Smith‏ @BRIAN_____ Oct 30
      Replying to @kennyog @colmmacc and

      Simply, any standardized or otherwise "accepted" PAKE.

      1 reply 0 retweets 0 likes
    9. kennyog‏ @kennyog Oct 30
      Replying to @BRIAN_____ @colmmacc and

      Worth reading the J-PAKE spec. It kinda punts on this.

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

      It says "The two communicating parties, Alice and Bob, both agree on (p, q, g), which can be hard-wired in the software code." (FWIW, the J-PAKE RFC cites the J-PAKE implementation I added to Firefox/NSS.)

      2:08 PM - 30 Oct 2018
      2 replies 0 retweets 0 likes
        1. New conversation
        2. Brian Smith‏ @BRIAN_____ Oct 30
          Replying to @BRIAN_____ @kennyog and

          I think it's probably true that many specifications for many protocols (PAKE and otherwise) don't explicitly call out the importance of authenticating security parameters like these. I know (almost?) every NIST spec does call it out explicitly and in high detail.

          2 replies 0 retweets 0 likes
        3. Thomas H. Ptacek‏ @tqbf Oct 30
          Replying to @BRIAN_____ @kennyog and

          People give SRP a lot of shit but the SRP white paper and the SRP RFCs explicitly demand a check for this attack.

          0 replies 0 retweets 3 likes
        4. End of conversation
        1. kennyog‏ @kennyog Oct 30
          Replying to @BRIAN_____ @colmmacc and

          "can" being the operative word, not "MUST"...

          0 replies 0 retweets 0 likes
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