Re: [Bug-gnuzilla] Fingerprints

[Claudio Fontana]

something involving canvas maybe? That info can be queried by the server afaik

On Saturday, March 29, 2014,  <address@hidden> wrote:
> Are you sure about that ? My source was an academic research a guy made, in Germany.
>
> On 2014-03-29 20:32, Narcis Garcia wrote:
> > 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
> >
> > --
> > http://gnuzilla.gnu.org
>
> --
> http://gnuzilla.gnu.org


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Claudio Fontana
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