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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. Mx. Lottie (Charlotte)  💜 🦊‏ @Foxsan48 24 Feb 2017
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      Replying to @marcan42 @CyberShambles

      I now feel a need to look into sha-1...320bytes...hmm research time

      1 reply 0 retweets 0 likes
    4. Hector Martin‏ @marcan42 24 Feb 2017
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      Replying to @Foxsan48 @CyberShambles

      SHA1 just processes the input in blocks. Once the state is the same, same input will change it in the same way.

      1 reply 0 retweets 0 likes
    5. Hector Martin‏ @marcan42 24 Feb 2017
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      Replying to @marcan42 @Foxsan48 @CyberShambles

      The actually collision blocks are 2x64 bytes, rest is the PDF header.

      1 reply 0 retweets 1 like
    6. Mx. Lottie (Charlotte)  💜 🦊‏ @Foxsan48 24 Feb 2017
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      Replying to @marcan42

      so SHA-1 uses 64byte segments/blocks?

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 24 Feb 2017
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      Replying to @Foxsan48

      Yes.

      4:00 AM - 24 Feb 2017
      • 1 Like
      • Mx. Lottie (Charlotte) 💜🦊
      1 reply 0 retweets 1 like
        1. Mx. Lottie (Charlotte)  💜 🦊‏ @Foxsan48 24 Feb 2017
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          Replying to @marcan42

          Thank you

          0 replies 0 retweets 0 likes
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