RFID noisy reader how to prevent from eavesdropping on the communication?

Abstract

RFID applications do not always use encryption to ensure the security as public key cryptographic algorithms that are costly in term of computing resources. We proposed to secure the communication from an ISO 14443 RFID card to the reader against passive eavesdropping at the physical layer by adding noise. During the card reply, the reader generates an appropriate noise that is modulated by the load of the card. By knowing the noise it emitted, the reader is able to subtract it and to retrieve the card message when a spying probe in the field is inefficient. © Springer-Verlag Berlin Heidelberg 2007.