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colmmacc's profile
Colm MacCárthaigh
Colm MacCárthaigh
Colm MacCárthaigh
@colmmacc

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Colm MacCárthaigh

@colmmacc

AWS, Apache, Crypto, Irish Music, Haiku, Photography

Seattle
notesfromthesound.com
Joined April 2008

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    1. Stephen Checkoway‏ @stevecheckoway 22 Jul 2017
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      There's been some drama in the TLS WG. I wrote it up. https://www.cs.uic.edu/~s/musings/tls13-enterprises/ …

      10 replies 143 retweets 141 likes
    2. Colm MacCárthaigh‏ @colmmacc 22 Jul 2017
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      Replying to @stevecheckoway

      Great write-up! I think what is urgent is modifying TLS 1.3 to forbid static-DH, otherwise it will happen regardless :( Feels like an attack

      1 reply 1 retweet 6 likes
    3. Colm MacCárthaigh‏ @colmmacc 22 Jul 2017
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      Replying to @colmmacc @stevecheckoway

      I'm firmly in the pragmatist camp too, and don't think finding an alternative solution is urgent, but DH should be enforceably ephemeral.

      1 reply 0 retweets 1 like
    4. Stephen Checkoway‏ @stevecheckoway 22 Jul 2017
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      Replying to @colmmacc

      I've been thinking about this a bit but I don't see how it could work. Even if a peer could prove it just generated the DH secret key, 1/2

      1 reply 0 retweets 0 likes
    5. Stephen Checkoway‏ @stevecheckoway 22 Jul 2017
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      Replying to @stevecheckoway @colmmacc

      how does it prove destruction of the key or that it didn't send the key to a key-logging server? 2/2

      1 reply 1 retweet 1 like
    6. Colm MacCárthaigh‏ @colmmacc 22 Jul 2017
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      Replying to @stevecheckoway

      It doesn't, but it raises the cost of that attack to the same as the cost of logging PMS. Always in favor of making attacks more expensive.

      2 replies 0 retweets 2 likes
    7. Colm MacCárthaigh‏ @colmmacc 22 Jul 2017
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      Replying to @colmmacc @stevecheckoway

      I also think of it as preventing an inadvertent implementation mistake, similar to how implicit nonces do for AEAD.

      1 reply 0 retweets 2 likes
    8. Stephen Checkoway‏ @stevecheckoway 22 Jul 2017
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      Replying to @colmmacc

      Maybe one could use a NIZK to prove knowledge of PRNG inputs used for DH sk, but who wants to verify a proof each TLS connection?

      2 replies 0 retweets 0 likes
      Colm MacCárthaigh‏ @colmmacc 22 Jul 2017
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      Replying to @stevecheckoway

      That's a smart idea. In practice it can enough that tools like SSLabs do it occasionally. That's how endpoint security is /really/ enforced.

      2:06 PM - 22 Jul 2017
      • 1 Retweet
      • 1 Like
      • Stephen Checkoway
      1 reply 1 retweet 1 like
        1. New conversation
        2. Stephen Checkoway‏ @stevecheckoway 22 Jul 2017
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          Replying to @colmmacc

          That's a really good point.

          1 reply 0 retweets 0 likes
        3. Nick Sullivan‏Verified account @grittygrease 22 Jul 2017
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          Replying to @stevecheckoway @colmmacc

          For comparison, CT validation is never enforced for privacy reasons. This might actually work.

          1 reply 0 retweets 0 likes
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