[$] Android wallpaper fingerprints

Uniquely identifying users so that they can be tracked as they go abouttheir business on the internet is, sadly, a major goal for advertisers andothers today. Web browser cookies provide a fairly well-known avenuefor tracking users as they traverse various web sites, but mobile apps arenot browsers, so that mechanism is not available. As it turns out, though,there are ways to "fingerprint" Android devices-and likely those of other mobileplatforms-so that the device owners can be tracked as they hopbetween their apps.