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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. Thomas H. Ptacek‏ @tqbf 16 Jul 2017
      • Report Tweet
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      Thomas H. Ptacek Retweeted John Viega

      Co-creator of GCM agrees it’s not great, would rather you not point that out.https://twitter.com/viega/status/886808443952271360 …

      Thomas H. Ptacek added,

      John Viega @viega
      Replying to @s7ephen @tqbf
      Sure, GCM'd look a bit different if done today. Don't see that @tqbf did better for the industry's needs ~15 years ago! Haters gonna hate.
      3 replies 3 retweets 23 likes
    2. Thomas H. Ptacek‏ @tqbf 16 Jul 2017
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      Replying to @tqbf

      GCM is the most widely supported AEAD (read: modern) cipher construction, because of a quirk of standards.

      1 reply 3 retweets 6 likes
    3. Thomas H. Ptacek‏ @tqbf 16 Jul 2017
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      Replying to @tqbf

      Specifically: a popular standard AEAD must simultaneously be (1) based on AES, (2) fast, and (3) not patent-encumbered.

      3 replies 3 retweets 5 likes
    4. Thomas H. Ptacek‏ @tqbf 16 Jul 2017
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      Replying to @tqbf

      (1) Rules out the ChaPoly family, which should by rights be the most popular AEAD. It’s not based on AES and will never have CPU hardware.

      2 replies 2 retweets 8 likes
    5. Thomas H. Ptacek‏ @tqbf 16 Jul 2017
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      Replying to @tqbf

      (2) Rules out things like SIV, which, unlike GCM, are safe for ordinary developers to use without thinking too hard about.

      4 replies 1 retweet 4 likes
    6. Colm MacCárthaigh‏ @colmmacc 16 Jul 2017
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      Replying to @tqbf

      Strong disagree! SIV is fatal if you need to worry about correlating plaintext. Worst case it can fail as bad as ECB if you apply it wrong.

      2 replies 1 retweet 2 likes
    7. Thomas H. Ptacek‏ @tqbf 16 Jul 2017
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      Replying to @colmmacc

      This is a really good point, but I think the GCM failure mode is more realistic, in that it happens routinely.

      1 reply 0 retweets 0 likes
    8. Thomas H. Ptacek‏ @tqbf 16 Jul 2017
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      Replying to @tqbf @colmmacc

      I know intellectually that whole-message repeats are an issue for SIV, but never saw a protocol where I could abuse, so not visceral to me.

      2 replies 0 retweets 1 like
    9. Colm MacCárthaigh‏ @colmmacc 16 Jul 2017
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      Replying to @tqbf

      Simple examples: would be pretty bad to encrypt passwords, or VOIP traffic, using SIV. Would break VOIP wide-open, which is interesting.

      2 replies 0 retweets 0 likes
    10. Tony “Abolish ICE” Arcieri  🦀‏ @bascule 16 Jul 2017
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      Replying to @colmmacc @tqbf

      AES-SIV can still take a nonce (i.e. headers)... it doesn't make sense to use it without a nonce except for keywrap

      1 reply 0 retweets 0 likes
      Colm MacCárthaigh‏ @colmmacc 16 Jul 2017
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      Replying to @bascule @tqbf

      Key-wrap can be its own SIV anti-pattern too :( E.g. wrapping flowlet keys/ids using SIV exposes system to flowlet-level TA.

      10:59 PM - 16 Jul 2017
      0 replies 0 retweets 0 likes

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