ProPublica and Mashable report on “canvas fingerprinting,” which is a new kind of online tracking tool. The report discusses a paper documenting canvas fingerprinting, “The Web never forgets: Persistent tracking mechanisms in the wild,” from researchers at Princeton University and KU Leuven University in Belgium. The researchers are: Gunes Acar, Christian Eubank, Steven Englehardt, Marc Juarez1, Arvind Narayanan and Claudia Diaz. ProPublica and Mashable report:
[T]his type of tracking, called canvas fingerprinting, works by instructing the visitor’s Web browser to draw a hidden image. Because each computer draws the image slightly differently, the images can be used to assign each user’s device a number that uniquely identifies it.
Like other tracking tools, canvas fingerprints are used to build profiles of users based on the websites they visit — profiles that shape which ads, news articles, or other types of content are displayed to them.
But fingerprints are unusually hard to block: They can’t be prevented by using standard Web browser privacy settings or using anti-tracking tools such as AdBlock Plus. Read more »