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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 Dec 2017
      • Report Tweet
      • Report NetzDG Violation

      Hector Martin Retweeted Hannah Grimm

      And then some script kiddie from 4chan with a GPU outs all the plaintexts, and/or sets up a Twitter bot to automate it. Be very, very careful with ad-hoc security "protocols" like this. Especially when your livelihood may be at stake.https://twitter.com/Dharlette/status/944183293653733376 …

      Hector Martin added,

      Hannah Grimm @Dharlette
      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 …
      Show this thread
      5 replies 14 retweets 40 likes
      Show this thread
    2. Hector Martin‏ @marcan42 23 Dec 2017
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      This is like that Catalonia hashed database for voter identification that ended up outing national ID / birthday / zipcode associations. Hashes aren't magical pixie dust. If the search space is bruteforceable, they amount to the illusion of security.

      2 replies 13 retweets 24 likes
      Show this thread
    3. Hector Martin‏ @marcan42 23 Dec 2017
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      If you *must* do this (and understand the risks), either use full legal names to maximize entropy and a very strong salted hash, like say bcrypt/scrypt tuned to take 5 seconds per hash on a CPU, or similar...

      2 replies 3 retweets 15 likes
      Show this thread
    4. Hector Martin‏ @marcan42 23 Dec 2017
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      ... 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.

      5 replies 1 retweet 18 likes
      Show this thread
    5. harce‏ @harce 24 Dec 2017
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      Replying to @marcan42

      Keeping there names a secret is not the point. Its against it actually. It just about getting some time to find others, without dropping a plaintext Google spreadsheet.

      1 reply 0 retweets 0 likes
    6. Hector Martin‏ @marcan42 24 Dec 2017
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      Replying to @harce

      I know. And I'm saying that won't work after someone writes a Twitter bot to reverse the hashes in seconds for the lulz, turning the approach into the equivalent of a plaintext Google spreadsheet.

      1 reply 0 retweets 1 like
    7. harce‏ @harce 24 Dec 2017
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      Replying to @marcan42

      Oh wow, public records that are meant to be accessible for other interested people are not fully secure? Who in the sec community would see that coming?!

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 24 Dec 2017
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      Replying to @harce

      I dunno, ask the OP, she seems to think it's not a problem and not worth discussing, considering, or making clear to those using this scheme.

      12:06 PM - 24 Dec 2017
      2 replies 0 retweets 0 likes
        1. New conversation
        2. harce‏ @harce 24 Dec 2017
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          Replying to @marcan42

          So you just assume that a bunch of women in the security industry have no idea what they are doing, while its quite obvious, and you can't understand why they are not interested in you explaining obvious stuff to them? Should I further explain why?

          1 reply 0 retweets 0 likes
        3. Hector Martin‏ @marcan42 24 Dec 2017
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          Replying to @harce

          I conclude that *one* woman (who is a biologist) is clearly not aware of the tradeoffs in the design of this purported hash-based protocol and also doesn't seem to be interested in discussing it before blindly giving advice to others.

          1 reply 0 retweets 0 likes
        4. Show replies
        1. New conversation
        2. harce‏ @harce 24 Dec 2017
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          Replying to @marcan42

          Protip; outing sexual predators is not a threat, its the point. If smbd decrypts the hash it ain't them making the accusations public. WTF do you expect them to do with salts if they are looking for people who are only connected to them by a "shared secret" which they use....

          1 reply 0 retweets 0 likes
        3. Hector Martin‏ @marcan42 24 Dec 2017
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          Replying to @harce

          Pro tip: if A posts a hash of B's name and C cracks it, C isn't going to get the blame and media attention for incriminating B. A is.

          1 reply 0 retweets 0 likes
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