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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. Erling Ellingsen‏ @steike 23 Feb 2017
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      Make your own colliding PDFs: https://alf.nu/SHA1 

      6 replies 282 retweets 271 likes
    2. William Hilton‏ @wmhilton 23 Feb 2017
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      Replying to @steike @Vjeux

      Hmm. I hope this can't be easily used to attack git repositories' integrity. Has git got any plans to upgrade from SHA1?

      1 reply 0 retweets 0 likes
    3. Hector Martin‏ @marcan42 24 Feb 2017
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      Replying to @wmhilton @steike @Vjeux

      The published collision cannot be used to attack Git because Git prefixes blobs with a header.

      2 replies 0 retweets 3 likes
    4. Hector Martin‏ @marcan42 24 Feb 2017
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      Replying to @marcan42 @wmhilton and

      Someone could use the same approach and spend the $100k to compute a Git-targeted prefix collision though.

      2 replies 0 retweets 3 likes
    5. William Hilton‏ @wmhilton 24 Feb 2017
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      Replying to @marcan42 @steike @Vjeux

      Could they though? I forgot about the prefix - it actually contains the blob length in bytes.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 24 Feb 2017
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      Replying to @wmhilton @steike @Vjeux

      Sure, it just means the length would have to be constant. Hardly a showstopper.

      5:09 AM - 24 Feb 2017
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