Re: [Bug-gnuzilla] Fingerprints

[Narcis Garcia]

As I know, cached files or their content aren't uploaded back to webserver.


Al 29/03/14 15:24, En/na address@hidden ha escrit:
> 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.
> 
> -- 
> http://gnuzilla.gnu.org