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lukechampine's profile
Luke Champine
Luke Champine
Luke Champine
@lukechampine

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Luke Champine

@lukechampine

I would like to understand things better, but I don’t want to understand them perfectly —Hofstadter

Somerville, MA
lukechampine.com
Joined November 2016

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    1. Damian Gryski‏ @dgryski Mar 1
      • Report Tweet

      Damian Gryski Retweeted Facebook Engineering

      This looks super useful.https://twitter.com/fb_engineering/status/1101557803775254528 …

      Damian Gryski added,

      Facebook EngineeringVerified account @fb_engineering
      We are releasing our implementation of LtHash, a specific homomorphic hashing algorithm, which we use to secure update propagation. https://code.fb.com/security/homomorphic-hashing/ …
      2 replies 0 retweets 7 likes
    2. Luke Champine‏ @lukechampine Mar 1
      • Report Tweet
      Replying to @dgryski

      From the paper: "We note that LtHash is *not* collision resistant among multiset inputs." This is because you can add the same input 2^16 times to produce sum = 0 (mod 2^16). There are ways to mitigate this, but their implementation doesn't. Something to be aware of.

      1 reply 1 retweet 1 like
    3. Steve Weis‏ @sweis Mar 1
      • Report Tweet
      Replying to @lukechampine @dgryski

      Supporting multisets is referred to in the paper. Here's some related work by @dfaranha etc al.: https://academic.oup.com/comjnl/article/60/4/476/2608055 … FB didn't need this use case so didn't implement support. Now that it's open source, someone can send a pull request.

      1 reply 1 retweet 3 likes
      Luke Champine‏ @lukechampine Mar 1
      • Report Tweet
      Replying to @sweis @dgryski @dfaranha

      Apologies, didn't mean to misrepresent your work! Hard to fit sufficient nuance in a tweet...

      5:32 PM - 1 Mar 2019
      1 reply 0 retweets 0 likes
        1. Steve Weis‏ @sweis Mar 1
          • Report Tweet
          Replying to @lukechampine @dgryski @dfaranha

          Nothing to apologize for. It's a good thing to point out.

          0 replies 0 retweets 0 likes
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