Tor Users Can Be Tracked Based on Their Mouse Movements
Independent security researcher Jose Carlos Norte has discovered a set of new methods of fingerprinting Tor users, which can be used to deanonymize them later on during abusive law enforcement investigations or cyber-surveillance campaigns.
The process of "user fingerprinting" refers to ways of tracking non-standard operations and details about a user's behavior. While analytics services track a bunch of such details, the Tor Browser provides protection against some of these actions in order to keep the user's identity a secret.
Fingerprinting is especially dangerous to Tor users because data recorded while they surf the Web via Tor browsers can then be compared to data logged while the user was surfing the same website with their regular browser.