In 2009-2011, we did some research work motivated with a positive goal of informing Internet users about certain risks of leaks in the browsing history. It pointed to a perhaps unexpected conclusion. This indicates that browsing history may be unique to the user. In our study, the number of unique user fingerprints was revealed by observing the set of websites visited as much as in 97% of cases. Furthermore, such fingerprints were stable over time (in 38% of the analyzed cases). We also found that the limitation to only 50 most popular sites, but the uniqueness was still significant.
It was the early 2010s. In 2020, the situation is different. Today, the user̵7;s private data is processed in a larger order of magnitude than in 2010. Fortunately, someone confirmed that the result holds.
See also: Bruce Schneier (Hacker News).
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