The Design And Security Analysis Of The Car’s Keyless Entry System Based On RFID Technology

With the rapid development of electronic technology, a large number of new electronic technologies are applied in modern cars, all kinds of electronic anti-theft devices appear one after another, but the car is stolen, the incidence of theft cases is still rising. By improving the automobile anti-theft security device, thereby ascending car anti-theft security, reliability, become the car manufacturers to solve the problem. Now, along with the continuous development of radio technology and application, especially the introduction of computer technology, the engineer of automobile anti-theft technology development, has the easy to operate, automatic, intelligent direction development.In this text, the traditional Remote Keyless Entry(RKE) system has carried on the thorough research and analysis, found its safety needs to be improved. Traditional RKE system just by the key end transmission a single fixed code for car terminal, by car terminal to judge its correctness, then realizing the function of lock car door control system, secrecy is accomplished by the length of the transmission coding, unable to deal with professional car theft by way of recording retransmission theft, or try all possible coding way of theft.This paper designed a based on Radio Frequency Identification(RFID) technology Passive Keyless Entry(PKE) system, the system without human intervention, Key holders through light touch door control switch, can realize the operation of open the door. This paper reference Keeloq technology, to ensure the transmit password security. Keeloq technology is a kind of more variability, strong anti-interference ability to intercept a new encryption technology, high reliability, transfer encoding with the method of the nonlinear encryption, thus achieving high secrecy of communication mode. Keyless enter the system sends a rolling code is unique, once effective, irregular, and cannot be predicted, tracking and interception and deciphering, thereby effectively make up for the shortcomings of traditional car door control system.The text design and debug for no keys into the hardware and software of the system. Hardware mainly include : high frequency receiving circuit, automobile base station side circuit design, car keys and circuit design, high frequency transmission circuit and so on. Software mainly include: low-frequency emission circuit, low frequency receiving circuit, etc. This article also carry out the system software design, the design use of low frequency awakens, technology to realize the system operation, low power consumption and the RF/LF communication and KEELOQ key techniques to software design, finally, the system overall test. Test results show that the Keyless enter the system power consumption, communication distance,cost and safety to meet the design index.