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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. David Wong‏ @cryptodavidw 25 Oct 2019
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      David Wong Retweeted Matthew Green

      This. I keep telling people that remote side channel attacks are grossly over estimated.https://twitter.com/matthew_d_green/status/1187745594917437440 …

      David Wong added,

      Matthew Green @matthew_d_green
      I continue to hope for the day that a timing attack on public-key cryptographic code is used in the wild, anywhere.
      2 replies 0 retweets 19 likes
      Colm MacCárthaigh‏ @colmmacc 26 Oct 2019
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      Replying to @cryptodavidw

      It's even worse. Concern about remote side-channels in AES-CBC have led to AES-GCM dominating, which has much more serious and practically exploitable security issues. It's a bonkers trade-off and a real failure of the cryptographic community to think practically.

      11:05 AM - 26 Oct 2019
      • 4 Retweets
      • 23 Likes
      • Dan P ꜳꝛꝍꞥ koto Max Peal uadm Xander Sherry Scott Piper Guillaume Ceccarelli Kostis
      3 replies 4 retweets 23 likes
        1. New conversation
        2. nothingmuch‏ @mHaGqnOACyFm0h5 26 Oct 2019
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          Replying to @colmmacc @cryptodavidw

          are you referring to nonce reuse issues? if so, what do you think is a pragmatic choice for aead that avoids it?

          1 reply 0 retweets 0 likes
        3. Colm MacCárthaigh‏ @colmmacc 26 Oct 2019
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          Replying to @mHaGqnOACyFm0h5 @cryptodavidw

          nonce-reuse with poor RNGs, and because AES-GCM is exactly length-matching, it makes mass surveillance via content fingerprinting far cheaper for adversaries. Both of these actual problems are actually exploited in the actual real world.

          1 reply 1 retweet 9 likes
        4. 3 more replies
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        2. Tony “Abolish ICE” Arcieri  🦀‏ @bascule 26 Oct 2019
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          Replying to @colmmacc @cryptodavidw

          CBC encryption isn’t parallelizable. I suspect that was more of a driver for CTR than concern over padding oracles. That said, it’s unfortunate that that none of the length hiding drafts for TLS went anywhere https://tools.ietf.org/id/draft-pironti-tls-length-hiding-00.html …

          1 reply 0 retweets 5 likes
        3. David Wong‏ @cryptodavidw 26 Oct 2019
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          Replying to @bascule @colmmacc

          TLS 1.3 has padding specified

          1 reply 0 retweets 0 likes
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        1. Adriano Maia‏ @adrianom 26 Oct 2019
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          Replying to @colmmacc @ivanristic @cryptodavidw

          With that in mind, which of the readly available combinations in common implementations should be used? Keeping in mind it would be good if they were support by current hardware acceleration. I know CBC sucks, but didnt know GCM had worse problems.

          0 replies 0 retweets 0 likes
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