RSA Security has developed a countermeasure to block scanning of radio-frequency ID tags, responding to privacy concerns about the tiny devices that would allow retailers and manufacturers to track the whereabouts of their goods within a store and beyond.The blocker tag, which can be placed over a regular RFID tag, prevents a receiver from scanning information transmitted by a tag by sending the receiver more data than it can read -- the equivalent of a denial-of-service attack. RSA doesn't have immediate plans to market the blocker and is waiting to see whether industry widely adopts RFID technology.
