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RFID technology (Radio Frequency Identification, RFID) is an automatic identification technology in the following bar code technology, biometrics, which uses radio frequency signal through space coupling (alternating magnetic and electromagnetic fields) to achieve non-contact transmission of information by transmitted information to achieve the purpose of identification. RFID technology has many outstanding advantages, for example, without manual intervention, without direct contact, without optical visualization to complete the entry and processing of information, can work in a variety of harsh environments, which can identify multiple tags, easy to operate and so on. Today, RFID technology has been recognized as the world top ten key technologies of the 21st century, has a broad application prospects in the manufacturing, retail, logistics, transportation and other aspects. Currently, radio frequency identification technology there are still many technical problems, such as: security, privacy issues, tag anti-collision problem, middleware issues, network deployment issues. In this paper mainly studied the privacy issues of RFID system security. With the extensive application of radio frequency identification technology, security and privacy issues increasingly get people's attention. RFID system security and privacy issues are not well resolved, its application will have significant limitations. This paper first introduces the research background of RFID and Research, describes the composition and the basic principles of RFID systems, and then analyze the existence of security privacy issues in RFID system. Several existing RFID security authentication protocol for RFID systems, the most important security and privacy issues, hash lock protocol, randomized hash lock protocol, hash chain protocol and hash-based authentication Good Reader agreement etc., and pointed out that the lack of these agreements. In response to these shortcomings, combined with the demand for security and privacy in RFID systems, an improved RFID security authentication protocol, the improved protocol is also based on Hash function, this agreement to a certain extent to ensure that the information transmitted between the reader and tag security. Secondly, improvements can be drawn by analyzing the agreement to meet safety and performance requirements. Then passed from the three aspects of security, the amount of computation and storage capacity comparing the obtained the improved protocol consolidated performance superior to other protocols. In order to better illustrate the security of the protocol using BAN logic logical proof of the improved protocol. Given after the completion of the proof of a specific instance to further spelled out in the agreement as a whole certification process. Finally, in the Visual Studio 2005 environment to achieve improved protocol software simulation. To simulate different output results by assuming a variety of legal and illegal tags, readers, as an example of the availability of improved protocol.
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