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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. Ben Adida‏ @benadida 23 Apr 2020

      5/ With G+A, on the other hand, at the protocol level, each phone can determine, thanks to its own clock and GPS, when and where the dangerous contacts occurred. While this might be useful, it is different than typical contact tracing and may violate infected people's privacy.

      1 reply 0 retweets 13 likes
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    2. Ben Adida‏ @benadida 23 Apr 2020

      6/ Now, Apple gives itself an out in its API docs: iOS might "fuzz" the date at which the contact happened, by up to a day. So the OS has the exact contact details, but may not release it to the app or user.

      1 reply 0 retweets 5 likes
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    3. Ben Adida‏ @benadida 23 Apr 2020

      7/ Also, in the G+A protocol, because infected identifiers are broadcast, there is a possibility that one could correlate that data with other information from bluetooth readers. It doesn't seem so bad to me because, again, contact tracing is useful when the # of cases is *low*.

      1 reply 0 retweets 3 likes
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    4. Ben Adida‏ @benadida 23 Apr 2020

      8/ Now, does France + Germany's ROBERT system solve this? Yes, but as I hinted earlier, with one giant caveat. In order to protect infected people's privacy, the ROBERT server keeps track of *everyone*'s random identifiers.

      2 replies 0 retweets 9 likes
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    5. Ben Adida‏ @benadida 23 Apr 2020

      9/ There's supposed to be no geo or other data tied to these random identifiers, but that assumes good citizenship behavior from apps. Also, that server better be kept secure, because if its data gets out, it undoes privacy protections built into phones' bluetooth stacks.

      1 reply 0 retweets 7 likes
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    6. Ben Adida‏ @benadida 23 Apr 2020

      10/ So, is it fair to say that France and Germany are trying to undermine the privacy properties of the G+A protocol? No, I don't think so. They're making a different privacy tradeoff, and they're *trying* to not create a surveillance database.

      1 reply 2 retweets 20 likes
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    7. Ben Adida‏ @benadida 23 Apr 2020

      11/ The ROBERT design also has the advantage of making it much easier to tweak the risk measurement algorithm over time (and possibly country), whereas for G+A that is built into the OS and won't change that easily.

      1 reply 2 retweets 7 likes
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    8. Ben Adida‏ @benadida 23 Apr 2020

      12/ Overall, I'm a good bit more comfortable with the G+A approach, which structurally protects against many bad server behaviors. And the G+A design does make use of the OS/app API layer to defend against the weakenesses that ROBERT tries to address at the protocol level.

      1 reply 2 retweets 17 likes
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    9. Ben Adida‏ @benadida 23 Apr 2020

      13/ But I don't think it's fair to discount the ROBERT approach by accusing it of disregarding privacy. That's not quite right. It's a *different* kind of privacy tradeoff. And it's more closely aligned with classic contact tracing.

      6 replies 3 retweets 26 likes
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    10. n[0}body, Security Minion‏ @curtisko 23 Apr 2020
      Replying to @benadida

      I don’t see this thread addressing misuse of the APIs later by say authoritarian regimes. Is that specificly outside the threat model being evaluated?

      3 replies 0 retweets 1 like
      Pinboard‏ @Pinboard 23 Apr 2020
      Replying to @curtisko @benadida

      Why would authoritarian regimes go after these APIs instead of the much higher granularity individual data stored on the phone or by the various private companies that collect it? What's a scenario where the API is the more inviting target?

      7:21 AM - 23 Apr 2020
      1 reply 0 retweets 0 likes
        1. n[0}body, Security Minion‏ @curtisko 23 Apr 2020
          Replying to @Pinboard @benadida

          Im not exactly sure TBH, just a thought that was provoked by @moxie on this topic, need s consideration IMO

          0 replies 0 retweets 0 likes
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