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canvas fingerprinting
Canvas fingerprinting is one of a number of browser fingerprinting techniques of tracking online users that allow websites to identify and track visitors using HTML5 canvas element instead of browser cookies or other similar means. The technique received wide media coverage in 2014〔〔〔〔 after researchers from Princeton University and KU Leuven University described it in their paper ''The Web never forgets''.〔
==Description==
Canvas fingerprinting works by exploiting the HTML5 canvas element. When a user visits a website with canvas fingerprinting, their browser is instructed to "draw" a hidden line of text or 3D graphic that is then converted to a digital token. Variations in which GPU is installed or the graphics driver cause the variations in the rendered digital token. The token can be stored and shared with advertising partners to identify users when they visit affiliated websites. A profile can be created from the user's browsing activity allowing advertisers to target advertising to the user's inferred demographics and preferences.〔〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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