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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
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    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. Ridley @ a safe distance‏ @11rcombs 23 Dec 2017
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      Replying to @marcan42

      none of which helps if someone knows you and your likely abusers

      1 reply 0 retweets 2 likes
      Hector Martin‏ @marcan42 23 Dec 2017
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      Replying to @11rcombs

      Exactly.

      7:15 AM - 23 Dec 2017
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      0 replies 0 retweets 1 like

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