A "blocker" tag is a privacy-enhancing radio-frequency identification (RFID) tag. It operates by interfering with the protocol in which a reader communicates individually with other RFID tags. While inexpensive to manufacture in quantity, blockers are nonetheless special-purpose devices, and thus introduce level of complexity that may pose an obstacle to their deployment.
We propose a variant on the blocker concept that we call <i>soft blocking</i>. This involves software (or firmware) modules… CONTINUE READING