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    Open Privacy

    openprivacy.ca · Company blog · on HN since 2018

    Open Privacy is a Canadian nonprofit research society building privacy tools like the Cwtch metadata-resistant chat app.

    Visit blogHN submissions
    Privacy & PolicySecurityOpen Source & Linux
    What HN says

    Commenters say founder Sarah Jamie Lewis's privacy work has been hugely influential, and they discuss Cwtch's move from Qt to Flutter and its funding limits.

    Stats for nerds
    19HN people shared it
    10linked in comments
    279story points
    Sep 2025last shared
    2018people per year2025

    Top posts on HN

    1. 1
      Unencrypted patient medical information is being broadcast across Vancouver
      4 people · 265 points · first shared 2019 · 110 comments on HN
    2. 2
      Open Privacy Research Society
      5 people · 3 points · first shared 2018 · Discussion on HN
    3. 3
      Flutter with Native Go Libraries (Desktop and Mobile)
      1 person · 3 points · first shared 2021 · Discussion on HN
    4. 4
      Cwtch: Privacy Preserving Infrastructure for Decentralized Applications
      3 people · 2 points · first shared 2018 · 1 comments on HN
    5. 5
      Cwtch Alpha 0.2.0
      1 person · 2 points · first shared 2019 · Discussion on HN
    6. 6
      Open Privacy Research Society
      1 person · 1 points · first shared 2018 · Discussion on HN
    7. 7
      Qwtch to Flwtch: Porting Cwtch's Go/Qt Front End to Go/Flutter
      1 person · 1 points · first shared 2021 · Discussion on HN
    8. 8
      Announcing Cwtch Alpha, a Start to Building Consensual Applications
      1 person · 1 points · first shared 2019 · Discussion on HN
    9. 9
      Discreet Log #19: Cwtch Roadmap (1.4 to 1.7)
      1 person · 1 points · first shared 2021 · Discussion on HN
    10. 10
      Discreet log
      1 person · first shared 2021

    What HN people wrote when they linked it

    • cool_cherrySep 2025

      There's a nugget of truth there, but I will say that the Swiss government has taken a very thorough/careful approach to implementing online voting. There are legislated cybersecurity standards for e-voting, individual and universal verifiability, pilot programs, meaningful observation, everything is open source, funding is set aside to incentivize researchers to find vulnerabilities [1].

      When critical vulnerabilities were found with the previous implementation done by a private vendor, they dropped their vendor and restarted from scratch, doing everything in-house [2,3].

      Not all jurisdictions are so careful. Over 200 municipalities in Ontario do voting online, despite no legislated standards (though a voluntary standard was recently developed). The voting systems are offered by private vendors, no organization is responsible for certifying these systems, and many systems do not offer any cryptographic verification of the results. It's quite interesting [4].

      [1] https://digital-solutions.post.ch/en/e-government/blog/vollst%C3%A4ndige-verifizierbarkeit-und-open-source-im-zuk%C3%BCnftigen-e-voting-system-der-post

      [2] https://openprivacy.ca/assets/knightsandknaves.pdf

      [3] https://www.swissinfo.ch/eng/politics/swiss-post-set-to-relaunch-its-e-voting-system/45820842

      [4] https://whisperlab.org/ontario-online.pdf

    • amatechaDec 2019

      Oh yeah, this has actually been a bit of a controversy in Vancouver recently[0][1], including speculation that the problem may be national. Local hospitals have now removed diagnosis data from the transmissions, but apparently still broadcast everything else, including "patient name, age, gender marker, their attending doctor and room number" (as of Sept 2019)[2].

      Vancouver Coastal Health claims they "have no information to suggest private patient information has been used in any malicious way", which is a very disingenuous statement to make, because there's no conceivable way for them to know who has received radio transmissions or made use of such data maliciously. To be frank, I find this pretty mind-blowing and it's disappointing that even in the face of press/public attention, it's not being remedied.

      [0] https://openprivacy.ca/blog/2019/09/09/open-privacy-discovers-vancouver-patient-medical-data-breach/

      [1] https://www.ctvnews.ca/health/pager-systems-used-in-healthcare-could-be-exposing-patient-data-across-canada-1.4727129

      [2] https://openprivacy.ca/blog/2019/09/26/pager-breach-update/

    • sarahjamielewisMar 2025

      There should be a link to the society website (https://openprivacy.ca/) on the Cwtch site, but I can see that there isn't - we will get that fixed.

      Open Privacy Research Society is a Canadian non profit society, founded in 2018, you can find details of our members and operating structure on our website. Most of our funds come from individual donations.

      Cwtch started as an extension to the Ricochet Tor messenger which I also contributed back in 2014/2015. Our main goal behind Cwtch was to establish that metadata resistant / p2p communication could be done in a similar form factor to traditional server based / non-metadata private protocols like Signal i.e. to try and push the privacy properties that people can wield beyond end to end encryption, in a way that is still usable.

    • AgalmicVenturesOct 2019

      You're absolutely right about the various advantages of pagers over cell phones.

      On the other hand, all of that medical information goes over the air in plain text. It is trivial to capture and decode POCSAG [1], requiring less than $100 of hardware: a Raspberry Pi 3 has enough horsepower to handle the 2 RTL-SDR's needed to capture both the 929MHz and 931MHz bands.

      Modern security simply demands that pagers go away (or at least be heavily modified). This is not a theoretical concern [2][3].

      [1] https://github.com/pvachon/tsl-sdr

      [2] https://www.rtl-sdr.com/art-installation-eavesdrops-on-hospital-pagers-with-a-hackrf/

      [3] https://openprivacy.ca/blog/2019/09/09/open-privacy-discovers-vancouver-patient-medical-data-breach/

    • octosphereOct 2018

      > where is the software that circumvents internet spying and censorship?

      1.) https://geti2p.net/

      2.) https://www.torproject.org

      3.) https://openprivacy.ca/blog/2018/06/28/announcing-cwtch/

      Tor is an obvious choice here and has penetrated the mainstream when Gawker ran that article on Silk Road. Now and then newspapers run sensationalist articles on the Dark Web in an attempt to wake up the masses about Tor and its famous (unsecure) Browser Bundle.

    • cheeseprocedureOct 2019

      A recent Canadian example:

      > The data being broadcast includes the patients name, age, gender marker, diagnosis, their attending doctor and room number. Other broadcasts regarding medical tests such as x-rays are often associated with a patients last name or medical number, exposing their progression through hospital departments.

      https://openprivacy.ca/blog/2019/09/09/open-privacy-discovers-vancouver-patient-medical-data-breach/

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