Blocker Tag Details

摘要

The blacker tag devised by Ron Rivest, Michael Szydlo, and myself is itself meant to be a simple, passive RFID device, similar in cost and form to an ordinary RFID tag. However, a blocker tag performs a special function. When a reader attempts to scan RFID tags that are marked as "private" (in a manner to be discussed below), a blocker tag jams the reader. More precisely, the blocker tag cheats the tag-to-reader communications protocol in such a way that the reader sees many billions of nonexistent tags and, therefore, stalls!