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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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    1. Colm MacCárthaigh‏ @colmmacc Apr 10
      • Report Tweet
      • Report NetzDG Violation

      From a look at the Cryptography paper, this looks basically the same as #DP3T design one, though with the anonimity benefit of rotating Mac addresses and ephemeral IDs at the same time. It's a good set of trade-offs.https://www.apple.com/newsroom/2020/04/apple-and-google-partner-on-covid-19-contact-tracing-technology/ …

      2 replies 3 retweets 28 likes
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      Colm MacCárthaigh‏ @colmmacc Apr 10
      • Report Tweet
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      One of the practical attacks here is that someone could target a victim for a false-contact event with an infected person. Relaying Bluetooth IDs collected from a hospital to their phone would do the trick. Human contact-tracing could eliminate the false positive, one hopes.

      11:06 AM - 10 Apr 2020
      • 3 Likes
      • Justin 👨‍💻 Mat Savage Garrett Rooney
      3 replies 0 retweets 3 likes
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        2. Harish M‏ @mallipeddi Apr 10
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          Replying to @colmmacc

          It has to be relayed within the 10 minute window but obviously it's possible to leave a phone in the ER of some hospital and have it constantly upload all the high-risk Bluetooth IDs and immediately relay them to all the attack targets elsewhere.

          1 reply 0 retweets 0 likes
        3. Colm MacCárthaigh‏ @colmmacc Apr 10
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          Replying to @mallipeddi

          Yep, it's also a hard attack to mitigate. Even you add some kind of active authentication, a bi-directional replay would defeat that too. Just like those amplifier attacks on wireless car fobs.

          1 reply 0 retweets 0 likes
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        1. Eric Ristad‏ @ristad Apr 11
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          Replying to @colmmacc

          Eric Ristad Retweeted Eric Ristad

          Failure to secure the user's identity before letting them issue EphIDs opens the system up to even stronger attackshttps://twitter.com/ristad/status/1248438067276496896 …

          Eric Ristad added,

          Eric Ristad @ristad
          #DP3T is designed to protect privacy but not to secure information. The current protocol is weak to pranking, doxing, freeloading, botting, and denial of service attacks. The information it provides is not assured and hence of uncertain value. https://github.com/DP-3T/documents 
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