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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. Jake Williams‏ @MalwareJake 26 Feb 2017
      • Report Tweet
      • Report NetzDG Violation

      Jake Williams Retweeted Hector Martin

      JPEG FTW. Note how the complexity of the PDF and JPEG standards allow the collision to take place. You can't do this with DOCX, XLSX, etc.https://twitter.com/marcan42/status/835175023425966080 …

      Jake Williams added,

      Hector Martin @marcan42
      This is how the SHA1 collision PDF format trick works (it's really an embedded JPEG format trick) pic.twitter.com/ogPuPegKL6
      2 replies 29 retweets 39 likes
    2. Dan Blank‏ @init99 26 Feb 2017
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      Replying to @MalwareJake

      @marcan42 I wouldn’t necessarily say can’t. Also that’s only 1 other file type- PK

      1 reply 0 retweets 0 likes
    3. Jake Williams‏ @MalwareJake 26 Feb 2017
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      Replying to @init99 @marcan42

      Oh, I understand it's only one other filetype. But many news reports do not. And I doubt it will be done any time soon.

      1 reply 0 retweets 0 likes
    4. Jake Williams‏ @MalwareJake 26 Feb 2017
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      Replying to @MalwareJake @init99 @marcan42

      The problem with PK is getting the compressed data collision and still have the decompressed data make sense.

      1 reply 0 retweets 0 likes
    5. Hector Martin‏ @marcan42 26 Feb 2017
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      Replying to @MalwareJake @init99

      PK has plenty of uncompressed headers to play around with, plus the data itself can be uncompressed.

      1 reply 0 retweets 0 likes
    6. Jake Williams‏ @MalwareJake 26 Feb 2017
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      Replying to @marcan42 @init99

      I understand the format, but does the MS Office standard support he full range of PK options?

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 26 Feb 2017
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      Replying to @MalwareJake @init99

      I would be rather surprised if it didn't support things like uncompressed mode and comments (if only to ignore them)

      7:31 PM - 26 Feb 2017
      1 reply 0 retweets 0 likes
        1. New conversation
        1. Dan Blank‏ @init99 27 Feb 2017
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          Replying to @marcan42 @MalwareJake

          good point re news. I’d guess @marcan42 is right on the uncomp blocks. Can test in May when the Shattered PoC is out

          1 reply 0 retweets 0 likes
        2. Hector Martin‏ @marcan42 27 Feb 2017
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          Replying to @init99 @MalwareJake

          Shattered PoC isn't going to help you here unless you have $100k to burn on Amazon. PDF-wise we already know the story.

          1 reply 0 retweets 0 likes
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