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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
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      This is how the SHA1 collision PDF format trick works (it's really an embedded JPEG format trick)pic.twitter.com/ogPuPegKL6

      10 replies 1,103 retweets 1,487 likes
    2.  👼 Ąż 杏‏ @angealbertini 24 Feb 2017
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      Replying to @marcan42

      as I expected from you ;)

      1 reply 0 retweets 4 likes
    3. Hector Martin‏ @marcan42 24 Feb 2017
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      Replying to @angealbertini

      Better late than never, eh :)

      1 reply 0 retweets 2 likes
    4.  👼 Ąż 杏‏ @angealbertini 24 Feb 2017
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      Replying to @marcan42

      you did pretty well. TBH my own diagrams are not that different - and less colorful

      1 reply 0 retweets 1 like
    5. Hector Martin‏ @marcan42 24 Feb 2017
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      Replying to @angealbertini

      The remaining question is... is the padding on the first comment random or did you hide something there? :-)

      1 reply 0 retweets 2 likes
    6.  👼 Ąż 杏‏ @angealbertini 24 Feb 2017
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      Replying to @marcan42

      nothing hidden

      1 reply 0 retweets 1 like
    7.  👼 Ąż 杏‏ @angealbertini 24 Feb 2017
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      Replying to @angealbertini @marcan42

      it's 16 bytes of pure randomness for easy distribution during the computation.

      2 replies 0 retweets 4 likes
    8. Hector Martin‏ @marcan42 24 Feb 2017
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      Replying to @angealbertini

      Interesting. Didn't know that part was relevant to the collision computation.

      2 replies 0 retweets 1 like
    9.  👼 Ąż 杏‏ @angealbertini 24 Feb 2017
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      Replying to @marcan42

      one last thing not visible in the poc: scan sizes optimization.

      1 reply 0 retweets 2 likes
      Hector Martin‏ @marcan42 24 Feb 2017
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      Replying to @angealbertini

      Yeah, I figured it takes a bit of finesse to get the JPEG data scans to optimally line up with comment lengths.

      10:42 AM - 24 Feb 2017
      • 1 Like
      • φ CelesteBlue φ
      1 reply 0 retweets 1 like
        1. New conversation
        1.  👼 Ąż 杏‏ @angealbertini 24 Feb 2017
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          Replying to @marcan42

          yup. multipage in 100% quality was doable. I learned 'JPEG wizardry' ;)

          2 replies 0 retweets 4 likes
        2.  👼 Ąż 杏‏ @angealbertini 24 Feb 2017
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          Replying to @angealbertini @marcan42

          cf https://github.com/pornel/libjpeg/blob/master/wizard.doc … cc @harlo

          0 replies 0 retweets 2 likes
          3. End of conversation

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