Those with no technical knowledge generally believe that they are anonymous when simply browsing the Web. Those who know more might recognize that IP addresses can be used to do some rough targeting, while browser cookies can be used to track someone across sessions and across IP addresses. But what if your browser itself—even with cookies off and IP addresses out of the picture—was leaving a digital fingerprint at every site you visit?

That possibility lies behind a new experiment from the Electronic Frontier Foundation, something called "Panopticlick."

Thursday, January 28, 2010
Ars Technica