However, everything seemed very clear. In his presentation ofStopCovid, the government has indicated that when you activate this device, the data that is transmitted to the central server concerns the people who have the application and with whom you have been in contactwithin one meter for at least 15 minutes. If you declare yourself as a carrier of covid-19, they will be informed that someone has potentially transmitted the virus to them.
A necessary collection according to the government
However, the reality seems much more complex. According toGaëtan Leurent, a cryptography researcher at the National Institute for Research in Computer Science and Automation, StopCovid actually collectsall the identifiers of the people crossed. This can potentially be a big crowd as the Bluetooth range can be up to 20 meters.
Contacted byMediapart, the government does not deny this information: “StopCovid is based on reporting the proximity history of a user diagnosed positive: this proximity history is made up of contacts encountered by the positive user. The calculation of the risk exposure of one of the contacts in this proximity history is carried out on the server», Specifies the State Secretariat for Digital Affairs.
This version does not convince the specialists in the file, starting with Gaëtan Laurent. The latter regrets that this calculation is not carried outdirectly by phone. The fear is indeed to see a malicious actor recover all of this data and infringe on the privacy of users.
For the government, on the contrary, this storage is necessary “by the fact that every quarter of an hour, a new identifier is assigned to each device. Thus, a contact which only lasts 5 minutes could be the continuation of a contact lasting twelve minutes: two contacts that only the server is capable of linking to understand that it is in reality a single one, lasting 17 minutes. , therefore at risk».
The CNIL clarified to our colleagues toMediapartwhatchecks were currently underway on the subject.
As a reminder, the development of StopCovid had already not been a long, quiet river and it had notably beenslowed down by the operation of iOS.
i-nfo.fr - Official iPhon.fr app
By : Keleops AG
