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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 23 Feb 2017
      • Report Tweet
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      Finally a SHA-1 collision. TL;DR: same-prefix collision, don't panic *yet*, but Git better start thinking of SHA-256 and don't trust PDFs.

      4 replies 55 retweets 44 likes
    2. Hector Martin‏ @marcan42 23 Feb 2017
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      Replying to @marcan42

      Remember, this SHA1 attack is *not* the attack that broke MD5 TLS certs and gave us Flame. *This* attack on MD5 you can run on a smartphone.

      2 replies 10 retweets 10 likes
    3. Hector Martin‏ @marcan42 23 Feb 2017
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      Replying to @marcan42

      This SHA1 attack does NOT allow you to collide an innocent-looking file with a malicious file. You need TWO blatantly malicious files.

      2 replies 13 retweets 10 likes
    4. Daniel Franke‏ @dfranke 23 Feb 2017
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      Replying to @marcan42

      With anything Turing-complete you can probably pull off "subtly malicious". Branch on a bit in the colliding block.

      2 replies 0 retweets 0 likes
    5. Hector Martin‏ @marcan42 23 Feb 2017
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      Replying to @dfranke

      Yes of course, that's why executable binaries (or things like PDF) are the easy way to use this attack.

      1 reply 0 retweets 0 likes
    6. Hector Martin‏ @marcan42 23 Feb 2017
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      Replying to @marcan42 @dfranke

      But it's not really practical with source code because hopefully the evil branch would raise eyebrows.

      1 reply 0 retweets 0 likes
    7. Daniel Franke‏ @dfranke 23 Feb 2017
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      Replying to @marcan42

      That would be an interesting theme for the Underhanded C Code Contest. Make the branch and the garbage block look innocuous.

      2 replies 0 retweets 0 likes
      Hector Martin‏ @marcan42 23 Feb 2017
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      Replying to @dfranke

      Part of the problem is the garbage is binary. But yes, that's what I just said on IRC actually )

      8:08 AM - 23 Feb 2017
      0 replies 0 retweets 0 likes

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