Comment by anthonyskipper
2 years ago
This ^. approach and modified forms of it can bu used to track lots of things, and have be done so for decades by some goverment agencies. You can use a method like this even if people are using encryption and lot of anonymous tunnels. You simply shape the traffic and watch where the shape of that traffic stops. Can track people realtime across almost any link, including things like Tor, etc.
I had to anonymize some data while still keeping some details. You could imagine individual trees that needed to be put into groups of similar trees so individual details were lost.
Anyway, these "trees" were effectively user behavior across all our products. I was shocked that simply knowing *when* (to within a second or two) a person did two or more things, you could narrow it down to *one single person* out of hundreds of millions.