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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. Thomas H. Ptacek‏ @tqbf Jun 6
      Replying to @liamdaws @patricktoomey @lvh

      Can you ask again without 6 layers of abstraction? What’s a specific example?

      1 reply 0 retweets 0 likes
    2. Liam Dawson‏ @liamdaws Jun 6
      Replying to @tqbf @patricktoomey @lvh

      A server that I trust gave me a signed representation of my birth certificate. I want to give it to you, and I want you to trust it, and I know you trust that server. We both can't talk to that server right now.

      1 reply 0 retweets 0 likes
    3. lvh‏ @lvh Jun 8
      Replying to @liamdaws @tqbf @patricktoomey

      That sounds like a signature. Ed25519 it.

      2 replies 0 retweets 1 like
    4. Patrick Toomey‏ @patricktoomey Jun 8
      Replying to @lvh

      Patrick Toomey Retweeted lvh

      Pretty good thread . Thanks for the chat @lvh.https://twitter.com/lvh/status/1005085612607787009 …

      Patrick Toomey added,

      lvh @lvh
      Replying to @liamdaws @tqbf @patricktoomey
      That sounds like a signature. Ed25519 it.
      2 replies 0 retweets 2 likes
    5. thaidn‏ @XorNinja Jun 8
      Replying to @patricktoomey @lvh

      No, don't use Ed25519. Use a probabilistic signature scheme that derives nonces from private key, message and some randomness.

      2 replies 0 retweets 0 likes
    6. lvh‏ @lvh Jun 8
      Replying to @XorNinja @patricktoomey

      Such as...?

      1 reply 0 retweets 0 likes
    7. thaidn‏ @XorNinja Jun 8
      Replying to @lvh @patricktoomey

      XEdDSA from @trevp__

      2 replies 0 retweets 0 likes
    8. Brian Smith‏ @BRIAN_____ Jun 8
      Replying to @XorNinja @lvh and

      Incidentally, I thought the XEdDSA specification was going to be updated to move the random value so that the private key and the message weren't in the same hash block, but https://signal.org/docs/specifications/xeddsa/ … doesn't seem to have that change. I wonder if that is actually the latest version.

      1 reply 0 retweets 1 like
    9. Brian Smith‏ @BRIAN_____ Jun 8
      Replying to @BRIAN_____ @XorNinja and

      If you care about fault injection attacks then I don't know that any variant of Ed25519 is good to use, because Ed25519 is usually implemented using x-coordinate only multiplication so you can't verify that the result is on the curve. (IDK if that's necessary or sufficient yet.)

      2 replies 0 retweets 0 likes
    10. Deirdre Connolly‏ @durumcrustulum Jun 8
      Replying to @BRIAN_____ @XorNinja and

      relatedlypic.twitter.com/74Rh0njhNF

      1 reply 0 retweets 0 likes
      Brian Smith‏ @BRIAN_____ Jun 8
      Replying to @durumcrustulum @XorNinja and

      *ring* always does a a private-public consistency check when loading (private) keys, unless you opt out of it. Otherwise, I don't think it makes sense to talk about "Curve25519" when deciding these things as you might have different answers for X25519, Ed25519, etc.

      5:41 PM - 8 Jun 2018
      • 1 Like
      • Deirdre Connolly
      1 reply 0 retweets 1 like
        1. Deirdre Connolly‏ @durumcrustulum Jun 8
          Replying to @BRIAN_____ @XorNinja and

          fair enough, i just love that gif whenever questions about x-only curve math pops up

          0 replies 0 retweets 0 likes
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