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Re: [Bug-gnuzilla] Fingerprints

From: Loic Duros
Subject: Re: [Bug-gnuzilla] Fingerprints
Date: Sat, 29 Mar 2014 20:39:49 -0400
User-agent: K-9 Mail for Android

I wonder if there's a way using _javascript_/dom events to tell whether an image is loaded from cache. Then sending data async would be trivial...

On March 29, 2014 3:19:13 PM EDT, Claudio Fontana <address@hidden> wrote:
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.




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