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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. Tom Wilson‏ @orpach 24 Dec 2017
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      Replying to @marcan42

      Random characters at the end of the input? Maybe non-printing characters between each letter.

      1 reply 0 retweets 0 likes
    5. Hector Martin‏ @marcan42 24 Dec 2017
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      Replying to @orpach

      If you do something like that then other victims will not be able to find your hash. If you're expecting them to brute force it, that's equivalent to just increasing the hash work factor.

      1 reply 0 retweets 0 likes
    6. Tom Wilson‏ @orpach 24 Dec 2017
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      Replying to @marcan42

      Ah. I didn't know that was something they'd be used for. (publishing, without naming someone is the only use I saw) That'd kind of defeat the point though, since anyone could check _everyone_ they can find on linkedin/imdb all at once.

      1 reply 0 retweets 0 likes
    7. Hector Martin‏ @marcan42 24 Dec 2017
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      Replying to @orpach

      Exactly. That's why I suggested either a very strong hash (to discourage bruteforcing) or a very weak one (to guarantee collisions).

      2 replies 0 retweets 0 likes
      Hector Martin‏ @marcan42 24 Dec 2017
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      Replying to @marcan42 @orpach

      If your goal is merely proof of knowledge then yes, the standard approach of publishing a hash of whatever you want plus some random padding is sufficient.

      2:22 AM - 24 Dec 2017
      0 replies 0 retweets 0 likes

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