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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. Hannah Grimm‏ @Dharlette 22 Dec 2017
      • Report Tweet
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      Hannah Grimm Retweeted sarah jeong

      Women posting hashes of their abusers names is a brilliant way of finding others until you have critical mass to come forward. It's the kind of thing cyberpunk stories about crypto would have contained had the genre not been defined by men.https://twitter.com/sarahjeong/status/943941331583299585 …

      Hannah Grimm added,

      sarah jeongVerified account @sarahjeong
      Women keep asking me if anything will actually change after Weinstein. I always say yes, if only because infosec, of all fucking things, has changed. https://www.theverge.com/2017/12/21/16807116/infosec-community-sexual-predators-weinstein-assault …
      Show this thread
      31 replies 1,179 retweets 2,915 likes
      Show this thread
    2. Hannah Grimm‏ @Dharlette 23 Dec 2017
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      A great many men have been up in my mentions pointing out that men can easily search a hash of their OWN names to identify women who are posting. Guys. Bros. Dudes. Abusers are ALREADY aware of the people they've targeted.

      3 replies 21 retweets 171 likes
      Show this thread
    3. Hannah Grimm‏ @Dharlette 23 Dec 2017
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      And for the "but Rainbow tables!" crowd... What if I told you that the goal of women posting hashes of their abusers names actually has nothing to do with protecting men? It's about not having to be the first one to speak out.

      11 replies 12 retweets 144 likes
      Show this thread
    4. Hector Martin‏ @marcan42 23 Dec 2017
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      Replying to @Dharlette

      You still don't get it. I know that's the goal. It doesn't matter what your goal is. If the hashes are reversible, *whatever your goal is* in using hashes can be subverted. You might as well just post plaintexts.

      1 reply 0 retweets 9 likes
    5. kechpaja‏ @kechpaja 23 Dec 2017
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      Replying to @marcan42 @Dharlette

      “Can” is *extremely* relative. It’s technically possible to invert a hash given given sufficient resources, but it’s definitely *not* the same as posting plaintext. There’s also some plausible deniability in that usually there are collisions.

      4 replies 0 retweets 3 likes
      Hector Martin‏ @marcan42 23 Dec 2017
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      Replying to @kechpaja @Dharlette

      Hector Martin Retweeted Hector Martin

      My point is that you *need* to be aware of exactly what the risks are. There are no collisions by default (for deniability purposes); I already mentioned *deliberately* engineering collisions for this purpose, but it needs to be explicit.https://twitter.com/marcan42/status/944586669143023617 …

      Hector Martin added,

      Hector Martin @marcan42
      ... or use a very *weak* hash, like the 6-digit prefix of the SHA1 (24 bits), to guarantee collisions and thus make it a probabilistic filter and not something you could brute force usefully.
      Show this thread
      8:57 AM - 23 Dec 2017
      0 replies 0 retweets 0 likes

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