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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. mcc‏ @mcclure111 24 Feb 2017
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      Wait whaaaaaaaaaat RT @marcan42pic.twitter.com/yX41fC7Mpj

      4 replies 59 retweets 75 likes
    2. Peter da Silva‏ @Resuna 24 Feb 2017
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      Replying to @mcclure111

      @cdevers @marcan42 So the PDF hash doesn't include the whole file?

      1 reply 0 retweets 0 likes
    3. Hector Martin‏ @marcan42 25 Feb 2017
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      Replying to @Resuna @mcclure111 @cdevers

      we're talking about a standard SHA-1 hash of the whole file.

      1 reply 0 retweets 0 likes
    4. Peter da Silva‏ @Resuna 25 Feb 2017
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      Replying to @marcan42 @mcclure111 @cdevers

      So you're saying that adding a specific block means that no change to the rest of the file changes the hash?

      1 reply 0 retweets 0 likes
    5. Hector Martin‏ @marcan42 25 Feb 2017
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      Replying to @Resuna @mcclure111 @cdevers

      Changing the rest of the file changes the hash, but the same change on both means the hash stays the same.

      1 reply 0 retweets 0 likes
    6. Hector Martin‏ @marcan42 25 Feb 2017
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      Replying to @marcan42 @Resuna and

      If A and B are colliding prefixes then SHA1(A||x) == SHA1(B||x) != SHA1(A||y) == SHA1(B||y).

      1 reply 0 retweets 1 like
    7. Peter da Silva‏ @Resuna 25 Feb 2017
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      Replying to @marcan42 @mcclure111 @cdevers

      Ah, two prefixes. Can't make arbitrary collisions. I see.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 25 Feb 2017
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      Replying to @Resuna @mcclure111 @cdevers

      You can make arbitrary same-prefix collisions if you have $100k, but the one Google released is good for PDFs.

      1:04 AM - 25 Feb 2017
      1 reply 0 retweets 0 likes
        1. New conversation
        1. Peter da Silva‏ @Resuna 25 Feb 2017
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          Replying to @marcan42 @mcclure111 @cdevers

          But since you have no control over the different texts, not particularly useful.

          1 reply 0 retweets 0 likes
        2. Hector Martin‏ @marcan42 25 Feb 2017
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          Replying to @Resuna @mcclure111 @cdevers

          You can control the interpretation of the file through file format trickery, as the PDF attack shows.

          0 replies 0 retweets 0 likes
          3. End of conversation

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