![]() ![]() This technique relies on the MutationObserver API and also enables to extract the noise vector generated by Canvas Defender. In this part, we show another technique to detect the presence of canvas defender. Nevertheless, we go further, since the goal of this post is to show how Canvas Defender can be rendered inefficient, or even harmful by making its users more trackable. Var imageData = context.getImageData(0, 0, width, height) Thus, the most simple solution to detect Canvas Defender is to look at the string representation of the toDataURL function. Detecting Canvas DefenderĪs several canvas countermeasures, Canvas Defender works by overriding functions related to canvas fingerprinting, such as toDataURL or getImageData. ![]() To have a more effective solution than simple canvas blockers, we show that it still has some flaws. ![]() How Canvas Fingerprint Blockers Make You Easily Trackable) ( Everything You Need to Know About Canvas Fingerprinting and Indeed, while on their website they claim in different posts The goal is to inform users on the privacy implications engendered by the usage of a countermeasure such as In this post, we show more in details how it is possible to bypass the canvas protection of Canvas Defender. One of the countermeasure we study in this paper is Canvas Defender,Ī browser extension for Chrome and Firefox that spoofs canvas fingerprints. The paper has been accepted at Usenix Security 18, and a free version is available on HAL. Of information they may indirectly leak by revealing their presence. Paper that evaluates the privacy implications of using fingerprinting countermeasures in particular regarding the quantity With other coworkers from the University of Lille, INRIA and Stonybrook university, we recently published a
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