Multi-tag content access control in RFID system

Abstract

Radio Frequency Identification (RFID) makes great flexibility and high efficiency for data acquisition in industry and daily life. At the other side, it brings the privacy risks and multiple tags collision issue. Current research in RFID system focuses on the security and privacy issue which is based on authentication protocols between a tag and a Reader. There is a need to design a reasonable protocol which takes care of both multi-tag anti-collision and security issue. This thesis presents a new protocol which combines both multi-tag anti-collision protocol and multi-tag content access control protocol. Firstly, the multi-tag anti-collision protocol and security protocol are analyzed and discussed. According to the theoretical basis, the new protocol is designed in order to meet the requirements of security and privacy for multi-tag in the context of anti-collision, improve the efficiency of identify process and the utilization of signal channel. This new protocol which uses hash lock is built on ALOHA anti-collision protocol. A priority register is introduced to the protocol, which is useful to deal with the multiple communications between Reader and tags. Simulation of the proposed protocol is designed under the environment of Matlab, using the graphic modeling tool GPenSIM. The main parameters of the simulation are referenced from ISO/IEC 18000 international standard. The results shows that the new protocol performs well at content access control together with the anti-collision, in this way multiple tags can be identified in batch. At the end of the thesis, one application about subway tickets access control system based on the new protocol is proposed.