Researchers at KU Leuven in Belgium have identified a number of online user tracking techniques that cannot be blocked by browsers' built-in anti-tracking defenses and existing anti-tracking and ad-blocking extensions.
The team also found no evidence these techniques are already being used by user tracking services and advertisers.
The researchers developed a framework to confirm that all imposed cookie- and request-policies are correctly applied. They say, however, "Worryingly, we found that most mechanisms could be circumvented: for instance for all ad-blocking and anti-tracking browser extensions we discovered at least one technique that could bypass the policies."
After testing seven browsers, 31 ad-blocking extensions, and 15 anti-tracking extensions, they identified seven categories of request-triggering mechanisms that can be applied to user tracking on at least one tested setup.
From Help Net Security
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