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colmmacc's profile
Colm MacCárthaigh
Colm MacCárthaigh
Colm MacCárthaigh
@colmmacc

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Colm MacCárthaigh

@colmmacc

AWS, Apache, Crypto, Irish Music, Haiku, Photography

Seattle
notesfromthesound.com
Joined April 2008

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    Colm MacCárthaigh‏ @colmmacc Apr 8
    • Report Tweet
    • Report NetzDG Violation

    So @Pinboard is probably right that large-scale contact tracing demands well-regulated access to mobile operators and advertising services data. But if we do go the forced-app route, how could it be minimally disclosing? I wrote up a cryptographic outline:https://gist.github.com/colmmacc/740e7db2d9c5836848c849c02f600ec9 …

    3:05 PM - 8 Apr 2020
    • 6 Retweets
    • 26 Likes
    • Justin Mason Tony “0-Chill ” Ropson Jens Boman Paul Kehrer Joshua Conner Fred Crowson Dan Guido Dan P Lincoln Stoll
    4 replies 6 retweets 26 likes
      1. Colm MacCárthaigh‏ @colmmacc Apr 8
        • Report Tweet
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        This scheme uses only boring cryptography (Diffie-Helman ftw) and boring tables. The gist explores the problem space too. I don't think the problem needs mix-networks, homomorphic or zero-knowledge intersection schemes.

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      2. Pinboard‏ @Pinboard Apr 9
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        Replying to @colmmacc

        How does this change if the *where* does turn out to be important? If epidemiologists are trying to identify hot spots and map them?

        1 reply 0 retweets 0 likes
      3. Colm MacCárthaigh‏ @colmmacc Apr 9
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        Replying to @Pinboard

        Once a contact can be identified, I suspect a lot of people would then give up their location history to the epidemiologist. That's different than having a very convenient searchable trove. It does make it more work for them to identify hotspots though.

        0 replies 0 retweets 0 likes
      4. End of conversation
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      2. Alexandre Yamajako‏ @CryptoBits_eu Apr 9
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        Replying to @colmmacc @Pinboard

        Have you heard about CEN and DP3T ? If not this might make for an interesting read :https://www.zfnd.org/blog/private-contact-tracing-protocols-compared/ …

        1 reply 0 retweets 0 likes
      3. Colm MacCárthaigh‏ @colmmacc Apr 9
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        Replying to @CryptoBits_eu @Pinboard

        Yes :) There's an issue open where two of us made the same suggesting of using full-mesh DH in that context too.https://github.com/DP-3T/documents/issues/87 …

        0 replies 0 retweets 0 likes
      4. End of conversation
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      2. Matthijs Mullender‏ @mullender Apr 8
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        Replying to @colmmacc @Pinboard

        Great write-up! Is there a reason to upload the shared value? If the users keep it on-device, and only upload the shares when they are tested positive. Other users can download/match their shares locally. Similar to haveibeenpwned, which also only stores compromised passwords.

        1 reply 0 retweets 1 like
      3. Matthijs Mullender‏ @mullender Apr 8
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        Replying to @mullender @colmmacc @Pinboard

        That way even the fact that A and B were ever together is secret. And more importantly A would never learn that it was B that infected them.

        0 replies 0 retweets 1 like
      4. End of conversation

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