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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. Chandler Carruth‏ @chandlerc1024 Jun 25

      Making the rounds, complete w/ sensationalized headline: https://www.theregister.co.uk/2018/06/22/intel_tlbleed_key_data_leak/ … Short version: libgcrypt doesn't follow best practices to avoid side channel leak of keys. Crypto that does (BoringSSL, OpenSSL, BearSSL, maybe others) shouldn't be impacted. Use them, update often.

      2 replies 8 retweets 31 likes
    2. Chris Williams‏ @diodesign Jun 25
      Replying to @chandlerc1024

      Cripes. I thought I'd gone for a minimal sensationalist headline ;) I think the story as a whole is balanced: it's non-trivial to exploit, Intel doesn't consider it major problem. As for BoringSSL etc, I'll defer to Ben's statement on the difficulties of mitigating TLBleedpic.twitter.com/H72c8PNLK9

      1 reply 0 retweets 0 likes
    3. Chandler Carruth‏ @chandlerc1024 Jun 25
      Replying to @diodesign

      For cryptographic software, I strongly disagree. The most widely used libraries do the right thing here. Libgcrypt is the exception and regarded as such by everyone I know in the crypto community.

      3 replies 0 retweets 1 like
    4. Brian Smith‏ @BRIAN_____ Jun 25
      Replying to @chandlerc1024 @diodesign

      I think it's a stretch to say the most widely used libraries do the right thing here unless you're talking specifically about Ed25519, which itself is actually hardly used. The emphasis on breaking crypto libs also seems like a red herring. Non-crypto apps usually don't even try.

      1 reply 0 retweets 0 likes
    5. Chandler Carruth‏ @chandlerc1024 Jun 25
      Replying to @BRIAN_____ @diodesign

      Most widely used libraries *for cryptographic software*. Other software indeed often doesn't even try. But in that case, you don't need TLBleed at all - any side-channel attack will work fine.

      1 reply 0 retweets 0 likes
    6. Brian Smith‏ @BRIAN_____ Jun 25
      Replying to @chandlerc1024 @diodesign

      I'd guess that OpenSSL 1.0.1 or earlier is probably the most common open-source crypto library and (1) it doesn't implement Ed25519, (2) It's ECC implementation leaves a lot to be desired for the curves it does implement, especially on non-x86-64. BoringSSL was fixed 9 weeks ago.

      2 replies 0 retweets 0 likes
      Brian Smith‏ @BRIAN_____ Jun 25
      Replying to @BRIAN_____ @chandlerc1024 @diodesign

      (BoringSSL always did Ed25519 the way it does now; I'm referring to the implementation of other curves.) Anyway, I don't mean to take away anything from OpenSSL or BoringSSL here but rather I'm just pointing out that it's far from clear that the problem is limited to libgcrypt.

      8:34 PM - 25 Jun 2018
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Chandler Carruth‏ @chandlerc1024 Jun 25
          Replying to @BRIAN_____ @diodesign

          (see other tweet - to the extent that is the case in both BoringSSL and OpenSSL, TLBleed doesn't seem to make it much worse than existing side-channel attacks)

          1 reply 0 retweets 0 likes
        3. Brian Smith‏ @BRIAN_____ Jun 25
          Replying to @chandlerc1024 @diodesign

          Well, that's less exciting then. I was hoping (having not read the paper that's not available yet) that it would be a more easily-exploitable side channel than the existing side channel attacks.

          0 replies 0 retweets 0 likes
        4. End of conversation

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