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[Bug-gnuzilla] Fingerprints

From: me
Subject: [Bug-gnuzilla] Fingerprints
Date: Sat, 29 Mar 2014 16:24:57 +0200
User-agent: Roundcube Webmail/0.9.5

I would like to report some additional findings:

One way to track a user is to use graphic files as a substitute for cookies. An image is created on a server with an identification number encoded as color information. This image will be saved on a user’s computer in the browser cache. When this user visits the website again, the locally stored image file will be opened and analyzed. The stored color information will be sent back to the server to make tracking possible. Since graphics are stored in a different location than cookies, they aren’t deleted when you clear your cookies. Other techniques include HTTP E-Tags, Flash cookies or web storage.

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