Open micb25 opened 4 years ago
Hiya - at present we're reporting just the raw numbers seen, which as you note at present are n*5 for .de, but are n+10 for .ch (mostly) and n+large-random for .at. So given the variability and that the padding schemes change, I think it best to continue to report the raw numbers in our survey for now. There is a note about the 10:1 and 5:1 ratios for the .de numbers on the web page too. (BTW, nice dashboard!) I hadn't known for sure that the change was on July 2nd though, so will add that. Thanks.
Hey there,
I am the owner of github.com/micb25/dka which analyzes and visualizes the TEK data of the German COVID-19 tracing app (Corona-Warn-App). There is also a dashboard version at github.io.
Concerning the German TEK data and your PDF on page 3:
Short answer: The German COVID-19 tracing app is producing a lot of fake TEKs to improve anonymity.
This fake multiplier ('padding multiplier') was in the beginning 10 (9:1) that is why you see these numbers like 90, 180, .... At the moment, this multiplier is 5 (4:1) which means that for every uploaded real TEK another four fake TEKs are being generated. For these fake TEKs, the identifier is filled with random bytes, but all other information are identical. You can find the currently estimated padding multiplier in my diagram here.
Consequently, if you correlate the German COVID-19 case numbers with the distributed TEKs you should correct them by the current padding multiplier.
Best regards, Michael