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>All of this contact tracing can be done in a privacy preserving way. Explain how having every person you're in contact with being tracked by governments and c

>All of this contact tracing can be done in a privacy preserving way. Explain how having every person you're in contact with being tracked by governments and corporations can be done in a 'privacy preserving way'. The very concept of contact tracing is probably the greatest violation of privacy I've seen proposed yet.

CubsFan1060 7y ago
Serious question -- have you looked into it at all how this works?
jws 7y ago
Read the spec, but in a nutshell you only report your tokens if you test positive. Then other people check to see if they have seen any reported tokens using a clever algorithm that doesn't involve them reporting all the tokens they have seen. The central authority just has a list of tokens from infected people. A corrupt central authority could also massively deploy token recorders across an area and then see when and where the infected people were seen, but governments already have that capability just from the cellular systems.
raphaelj 7y ago
It's totally possible to create an anonymous and decentralised contact tracing app that does not share private data. That is what Apple-Google are working on, and what projects such as D3P-T, or my hobby contact tracing app [1] are trying to achieve. --- [1] https://github.com/RaphaelJ/covid-tracer/blob/master/README.md https://github.com/RaphaelJ/covid-tracer/blob/master/README....
DennisP 7y ago
Simple. The system doesn't track every person you're in contact with. A simple method is to have phones directly exchange random numbers over bluetooth. If and only if someone tests positive, they publish their phone's recent random number transmissions. All phones download all published random numbers (just random numbers, no personal info) and see whether they've received any of them via bluetooth. This way the phone knows whether it's been in contact with someone who tested positive, but nobody else knows. Since the user has a strong incentive to get a covid test at that point, that's fine.

CubsFan1060 7y ago

Serious question -- have you looked into it at all how this works?

jws 7y ago

Read the spec, but in a nutshell you only report your tokens if you test positive. Then other people check to see if they have seen any reported tokens using a clever algorithm that doesn't involve them reporting all the tokens they have seen. The central authority just has a list of tokens from infected people. A corrupt central authority could also massively deploy token recorders across an area and then see when and where the infected people were seen, but governments already have that capability just from the cellular systems.

raphaelj 7y ago

It's totally possible to create an anonymous and decentralised contact tracing app that does not share private data. That is what Apple-Google are working on, and what projects such as D3P-T, or my hobby contact tracing app [1] are trying to achieve. --- [1] https://github.com/RaphaelJ/covid-tracer/blob/master/README.md https://github.com/RaphaelJ/covid-tracer/blob/master/README....

DennisP 7y ago

Simple. The system doesn't track every person you're in contact with. A simple method is to have phones directly exchange random numbers over bluetooth. If and only if someone tests positive, they publish their phone's recent random number transmissions. All phones download all published random numbers (just random numbers, no personal info) and see whether they've received any of them via bluetooth. This way the phone knows whether it's been in contact with someone who tested positive, but nobody else knows. Since the user has a strong incentive to get a covid test at that point, that's fine.