Tiré de: http://www.linuxsecurity.com/
Misconception: Cookies are not a security/privacy risk. However, when
combined with HTTP Referer field and cross-site imbedded images,
they can be used to track user's activities. Users have sued sites like
DoubleClick that have massive cross-site imbedded images over the
privacy information they collect.
Cookies receive most of the blame for this.
Example: The biggest privacy hole is when cookies are combined with
the HTTP Referer field. If many sites imbed images (like
advertisements) from a single site, that single site can use cookies
in order to track a user going among those sites. The cookie does
not identify who the user is, but can track what the user does.
Other information, like web-site logons, can then be combined with
this information in order to track how the person is.
Key point: Cookies are not a security hole in themselves.
However, they can be combined in interested ways with
other browser features in order to create big security and privacy holes.
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TI-YEN-TOA