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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 16 Oct 2017
      • Report Tweet
      • Report NetzDG Violation

      Is anyone else annoyed that the WPA2 KRACK paper author sat on it for >2mos before any disclosure and 5mos before public disclosure?

      11 replies 60 retweets 132 likes
      Show this thread
    2. Hector Martin‏ @marcan42 16 Oct 2017
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      Amusingly, when I implement a protocol like this I pretty much always use an explicit state machine like that. Avoids this kind of problem.

      1 reply 0 retweets 5 likes
    3. Tavian Barnes‏ @tavianator 16 Oct 2017
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      Replying to @marcan42

      Seems it didn't entirely avoid it though: https://ftp.openbsd.org/pub/OpenBSD/patches/6.0/common/041_net80211_replay.patch.sig …

      1 reply 0 retweets 0 likes
    4. Hector Martin‏ @marcan42 17 Oct 2017
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      Replying to @tavianator

      Hmm, the memcmp part of that patch of old vs new key makes me wonder if you could flip-flop between two keys by replaying packets.

      1 reply 0 retweets 0 likes
    5. Tavian Barnes‏ @tavianator 17 Oct 2017
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      Replying to @marcan42

      Ha good question. Haven't read the code thoroughly, hopefully there's some reason a "message 3" from a different handshake would be rejected

      1 reply 0 retweets 0 likes
    6. Tavian Barnes‏ @tavianator 17 Oct 2017
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      Replying to @tavianator @marcan42

      Also here's some additional comments that were added yesterday: https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/sys/net80211/ieee80211_pae_input.c.diff?r1=1.30&r2=1.31 …

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 17 Oct 2017
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      Replying to @tavianator

      I *think* it's okay because different messages should have different replay counter values, but I haven't analyzed it in detail.

      12:46 PM - 17 Oct 2017
      0 replies 0 retweets 0 likes

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