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The light inside is broken, but I still work. The Cadillac of online bookmarking sites. Alleged nocoiner. http://pinboard.in  maciej@ceglowski.com +1 415 610 0231

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    1. Matthew Green‏Verified account @matthew_d_green 2 Nov 2019

      The EFF has a piece out on how client-side scanning ‘breaks’ end-to-end encryption. They take a pretty strong position here (one I happen to agree with.) But I thought it would be helpful to explain my specific technical concerns. Thread: 1/https://www.eff.org/deeplinks/2019/11/why-adding-client-side-scanning-breaks-end-end-encryption …

      9 replies 209 retweets 427 likes
      Show this thread
    2. Matthew Green‏Verified account @matthew_d_green 2 Nov 2019

      Just to explain what we’re talking about: many current unencrypted messaging systems scan every photo sent through the service, in order to detect abusive content (CP). Encrypted messaging systems can’t do this. Hence proposals to do scanning on the client side. 2/

      1 reply 4 retweets 45 likes
      Show this thread
    3. Matthew Green‏Verified account @matthew_d_green 2 Nov 2019

      The service would send down some kind of list of content hashes that are problematic, and your app would check for matches before encrypting the message/photo/whatever. 3/

      2 replies 2 retweets 37 likes
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    4. Matthew Green‏Verified account @matthew_d_green 2 Nov 2019

      The problem with this approach is that it’s subject to abuse in two ways. 1. The system is designed to filter “bad” content, and “bad” means different things to different people. 2. Even if the service provider is decent, bad actors can slip inappropriate content into the DB.

      5 replies 5 retweets 64 likes
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    5. Matthew Green‏Verified account @matthew_d_green 2 Nov 2019

      People tend to discount the first concern because we live in a society of laws, etc. But it’s helpful to imagine how an authoritarian government will use this system. In fact, you don’t have to imagine. Just use WeChat. 5/

      4 replies 6 retweets 62 likes
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    6. Matthew Green‏Verified account @matthew_d_green 2 Nov 2019

      But even if you live in a healthy democracy (good for you) and you basically trust that this system will be used for good, there’s still the possibility of abuse. To prevent that, someone needs to audit the database to make sure everything in it is supposed to be there. 6/

      3 replies 3 retweets 33 likes
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    7. Pinboard‏ @Pinboard 2 Nov 2019
      Replying to @matthew_d_green

      These concerns seem to apply equally to the status quo (large hash databases used at Facebook and other image sharing sites)

      1 reply 1 retweet 0 likes
      Pinboard‏ @Pinboard 2 Nov 2019
      Replying to @Pinboard @matthew_d_green

      The EFF argument seems frankly incoherent to me, but maybe I'm missing something important

      10:30 AM - 2 Nov 2019
      0 replies 0 retweets 0 likes

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