The technique leverages the use of favicons, the tiny icons that websites display in users’ browser tabs and bookmark lists. Researchers from the University of Illinois, Chicago said in a new paper that most browsers cache the images in a location that’s separate from the ones used to store site data, browsing history, and cookies. Websites can abuse this arrangement by loading a series of favicons on visitors’ browsers that uniquely identify them over an extended period of time.
Powerful tracking vector
“Overall, while favicons have long been considered a simple decorative resource supported by browsers to facilitate websites’ branding, our research demonstrates that they introduce a powerful tracking vector that poses a significant privacy threat to users,” the researchers wrote. They continued:
Read 10 remaining paragraphs | Comments