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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 24 Feb 2017
      • Report Tweet
      • Report NetzDG Violation

      So many people are getting the SHA1 story wrong. With the collision that Google released, *anyone* can create colliding PDFs for *free*.

      13 replies 353 retweets 396 likes
    2. Hector Martin‏ @marcan42 24 Feb 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @marcan42

      You can take the two sets of 320 bytes that were published, append *anything* to both sets, and they will still have the same hash.

      6 replies 105 retweets 105 likes
    3. pinkie pie‏ @yourcompanionAI 24 Feb 2017
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      Replying to @marcan42 @notdan

      So literally anything that parses from the bottom up is fucked?"

      1 reply 0 retweets 0 likes
    4. Hector Martin‏ @marcan42 24 Feb 2017
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      Replying to @yourcompanionAI @NO_BOOT_DEVICE @notdan

      The specific collision released is only useful for PDFs and for the (few) file formats that parse bottom up (...)

      1 reply 1 retweet 3 likes
    5. Hector Martin‏ @marcan42 24 Feb 2017
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      Replying to @marcan42 @NO_BOOT_DEVICE @notdan

      (...) *and* can reference prior data with either no header or something in the collision blocks passes for a header.

      1 reply 1 retweet 2 likes
      Hector Martin‏ @marcan42 24 Feb 2017
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      Replying to @marcan42 @NO_BOOT_DEVICE @notdan

      I'm not sure if any such formats exist. They probably do, but can't think of one off the top of my head.

      7:31 AM - 24 Feb 2017
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      • uɐpʇou@ ✸ pinkie pie Matt Blackmon
      0 replies 1 retweet 2 likes

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