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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. Ivan Ristic‏ @ivanristic 17 Jun 2015
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      Of course, DHE can provide forward secrecy. The only catch is that you have to custom-generate strong parameters and rotate them regularly.

      6 replies 10 retweets 2 likes
    2. Colm MacCárthaigh‏ @colmmacc 17 Jun 2015
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      Replying to @ivanristic

      @ivanristic Even for 2048-bit? seems overkill. Protocols like IPSEC have the group coded into the spec too.

      1 reply 0 retweets 0 likes
    3. Ivan Ristic‏ @ivanristic 17 Jun 2015
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      Replying to @colmmacc

      @colmmacc In practice? No. For the sake of an argument, why not minimise the amount of data protected by the same DH parameters?

      1 reply 0 retweets 0 likes
    4. Colm MacCárthaigh‏ @colmmacc 17 Jun 2015
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      Replying to @ivanristic

      @ivanristic potential entropy leak, dangerous with bad RNGs, more code == more chance of error, generators can be slow and broken too.

      1 reply 0 retweets 0 likes
    5. Ivan Ristic‏ @ivanristic 17 Jun 2015
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      Replying to @colmmacc

      @colmmacc Sounds like an argument not to use computers at all ;)

      1 reply 0 retweets 0 likes
      Colm MacCárthaigh‏ @colmmacc 17 Jun 2015
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      Replying to @ivanristic

      @ivanristic Security is trade-offs, so all trade-off arguments sound like that and are judgement calls :/ In this case risk/reward seems low

      2:51 PM - 17 Jun 2015
      3 replies 0 retweets 0 likes
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        2. Ivan Ristic‏ @ivanristic 17 Jun 2015
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          Replying to @colmmacc

          @colmmacc So as a layman, how do I know that tomorrow we won’t hear that 2048-bit DH parameters are easy to break :)

          1 reply 0 retweets 0 likes
        3. Colm MacCárthaigh‏ @colmmacc 17 Jun 2015
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          Replying to @ivanristic

          @ivanristic If 2048-bit is easy to break, then it's likely that RSA is too. At that point it's best to have alg diversity. RSA + ECDHE

          1 reply 0 retweets 0 likes
        4. 3 more replies
        1. Ivan Ristic‏ @ivanristic 17 Jun 2015
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          Replying to @colmmacc

          @colmmacc Right, but we’ve just been effectively told: “you know all that story about PFS and DHE; that was all a lie”.

          0 replies 1 retweet 0 likes
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        1. Ivan Ristic‏ @ivanristic 17 Jun 2015
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          Replying to @colmmacc

          @colmmacc No need to answer, it’s all hypothetical anyway. If you need that level of security, you shouldn’t be using TLS :)

          0 replies 0 retweets 1 like
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