Research On The Radio Frequency Identification And Anti-Collision Algorithm

In recent years as the use of military information communication is becoming more and more frequent, crypt equipments which can encrypt communication data are playing an even more important role in different apartments within the army to insure the secure transmission of information. Therefore the secure management and the stability of usability of the identity authentication module of the crypt equipments become more important. But traditional contact IC authentication module is vulnerable to be unstable in wet and warm or on vehicle circumstances, and the management of a big number of IC cards is difficult. All above can not accommodate the diversification of the military indemnificatory mission. Nowadays the raido frequency(RF) technology is mature. Although compare with traditional method, using contactless RF card has the problem in secure transmission and disadvantage of high cost, it is more secure to storage data and is stable in transmitting data. Taking contactless RF card technology as a complimentarily to the traditional method can insure the security of the data storage within the identity authentication module and provide stable and reliable technical support to secret communication under special circumstances.After a deep study on current technical criterions of short distance wireless RF communication and practical technology of contactless identity authentication module, this paper presents a method of wireless RF identity authentication, and gives an analysis of the system structure of the RF identity authentication which aims to resolve problems that the secure management within the RF identity authentication module, the confidentiality in data transmission and the design of anti-collide protocol under multi-tags environments.Main work includes:1 After research and analysis on RF identification protocol and the practical technology of contactless identity authentication module is done, considering the secure and confidentiality demand of RF identity authentication module of crypt equipments when at storage and transmitting, a system structure of the confidential system identity authentication is proposed.2 In the secure management of data storage aspect, authentication tag memorizer is divided into logic partition. Access passwords of different authorization are shared between reader and authentication tag to get different access authorization. Authentication tag does its own operation according to its access authorization. All above enhance the storage security and manageability of the authentication system. 3 Referring to the security and confidentiality of data transmission in the air interface, a two way authentication mechanism is added between reader and authentication tags. Dispensing key session is between reader and tags and the use of key session encrypting transmission of data ensures the confidentiality in wireless data transmission.4 A slot anti-collision algorithm based on dynamic random is designed, which dynamically changes the total slot number of system by estimating the number of un-authenticated tags and resolves the two point collision problem though calculating number of collision points mechanism. Then simulation is programmed in C#.net environment. Analyzing of the result of simulation data reveals that the recognition efficiency of the algorithm is above 55%, which proves that the algorithm has advantage over most of others.