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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. Brian Smith‏ @BRIAN_____ May 14
      • Report Tweet
      • Report NetzDG Violation

      Brian Smith Retweeted Justin Cormack

      “Storing zero is consistently about 17% to 18% faster than storing one, both in the region covered by the L3 (up to 6 MiB on my system), and beyond that where we expect misses to RAM...” Uh...https://twitter.com/justincormack/status/1260899139166011392 …

      Brian Smith added,

      Justin Cormack @justincormack
      "Amazon’s new Graviton processor is very interesting ... The RAM performance is the highest out of all hardware tested." @trav_downs on memory and zeros https://travisdowns.github.io/blog/2020/05/13/intel-zero-opt.html …
      3 replies 13 retweets 32 likes
    2. Tim Ruffing‏ @real_or_random May 15
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      Replying to @BRIAN_____

      To be fair this applies only to full 64-byte zeros.

      1 reply 0 retweets 2 likes
    3. Orr Dunkelman‏ @CryptoOrrDun May 15
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      Replying to @real_or_random @BRIAN_____

      And yet timing attacks will exist. Waiting for a combination of Genkin @yuvalyarom @eyalr0 Brumely and the "usual lot" to show the exact details

      1 reply 0 retweets 0 likes
    4. Tim Ruffing‏ @real_or_random May 15
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      Replying to @CryptoOrrDun @BRIAN_____ and

      I wouldn't bet on the fact that you can make timing attacks work. I wouldn't bet on the opposite either.

      2 replies 0 retweets 2 likes
    5. Orr Dunkelman‏ @CryptoOrrDun May 15
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      Replying to @real_or_random @BRIAN_____ and

      Famous Last Words - this has a small chance of generating a side channel.

      1 reply 0 retweets 2 likes
    6. Tim Ruffing‏ @real_or_random May 15
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      Replying to @CryptoOrrDun @BRIAN_____ and

      I guess if you have an encryption algorithm that takes 64 byte messages, copies them in memory and in the end clears out the copy by overwriting with zeros, then you could be able to determine whether the message is 0...0 or not.

      3 replies 0 retweets 2 likes
    7. Brian Smith‏ @BRIAN_____ May 15
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      Replying to @real_or_random @CryptoOrrDun and

      It doesn’t need to be 64 byte messages. Imagine a N byte secret plaintext written to a larger buffer (often cache-line-aligned) with all contents zero before, and/or which is zeroed after. You could in theory now test that some (sub)sequence(s) of this plaintext are all zero.

      2 replies 0 retweets 1 like
    8. Colm MacCárthaigh‏ @colmmacc May 15
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      Replying to @BRIAN_____ @real_or_random and

      You could also use it to measure the amount of padding if the padding is all-zeroes (as TLS1.3's is). But I suspect that's already leaked in practice by the time to copy the non-padding bytes into application space.

      1 reply 0 retweets 3 likes
      Colm MacCárthaigh‏ @colmmacc May 15
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      Replying to @colmmacc @BRIAN_____ and

      I'd be more worried about differential techniques against asymmetric algorithms, where one could explore inputs that generate outputs or intermediate values with runs of zeroes and that may leak information about the key.

      11:30 AM - 15 May 2020
      • 3 Likes
      • Tim Ruffing Nimrod Aviram Brian Smith
      0 replies 0 retweets 3 likes

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