Securing InductivelyCoupled Communication （确保InductivelyCoupled沟通）.pdfVIP

Securing Inductively-Coupled Communication Lav R. Varshney, Pulkit Grover, and Anant Sahai Research Laboratory of Electronics, Massachusetts Institute of Technology IBM Thomas J. Watson Research Center Wireless Foundations, University of California, Berkeley Department of Electrical Engineering, Stanford University Abstract—Communication over inductively-coupled links is transmission wavelength. As antennas are brought to near- becoming prevalent in service delivery for medical, financial, field, the nature of interaction changes fundamentally. Rather and physical security applications and so there is a growing than the transmitting antenna remotely oscillating electrons in need to prevent eavesdropping. This paper presents circuit- theoretic and communication-theoretic models of inductively- the receiving antenna, there is magnetic flux that induces a coupled communication systems. Due to coupling, the presence current from one antenna to the other through the air. Hence, of an eavesdropper detunes the transfer function between the unlike traditional models of wireless channels [13] where the legitimate users. It is shown this detuning can be detected to channel between the legitimate parties is independent of the reveal the presence of the eavesdropper. Further, if capacity- channel used by the eavesdropper, all parties are mutually approaching codes are employed, neither the eavesdropper nor the legitimate receiver are able to reconstruct the transmit- coupled. ted message wi