The Research On Communications Security And Data Transmission Based On RFID System

Radio frequency identification (RFID)can carry out contactless identification between tag and reader, and a number of labels can be anti-collision operation, so that we can solve many of the deficiencies of traditional identification technology. As important part of radio frequency signal processing, air data transmission have great significance for the implementation of RFID system.In the process of data transmission sometimes requires more than reading labels at the same time. Application of anti-collision technology to identify a number of labels is an effective method of identification.In wireless communication technology, there has been problem of collision not to be solved well for many years.The corresponding solution method of multiple access are basically four:space division multiplexing(SDMA) method, frequency division multiplexing (FDMA) law, time division multiple (TDMA) method, as well as code division multiplexing(CDMA) method,in which code division multiplexing (CDMA) method wasn't be used as anti-collision by radio frequency identification system.This paper utilizes NI corporation's development tool-LabVIEW to design the emulate system structure of digital modulation module and baseband encoding module.This program module isn't only be able be used separately, but also can be integrated into a much larger project, provides useful function component for large scale RFID test platform, avoids repeated design.The encryption technology of information of RFID card is analyzed and studied comprehensively in this paper.In present,the encryption algorithm is short of security.Thus information is easy to be lost.A mixed encryption algorithm which based on stream cipher technique and RSA algorithm is proposed. The use of symmetric key cryptography to encrypt confidential information to be transmitted, while at the same time,such as using RSA asymmetric key cryptography to send DES key. This password can be an integrated system able to perform two advantages, namely, simple high-speed DES and RSA key management convenience and safety.The presented encryption algorithm provides more integrated and safety solutions to the security of RFID card.In order to get better analysis of encryption security of the thesis,a number of related formulas and algorithms are derived and proved,at the same time some of the main parameters of RF tags are discussed,and we can get the encryption algorithm to generate large prime numbers of the optimization.