无钥匙进入系统中HITAG2加密算法研究

HITAG2 Encryption Algorithm Based on the Keyless Entry System

从数学的角度对无钥匙进入系统中的HITAG2加密算法进行了理论分析和推导.分析了HITAG2加密算法中的线性反馈移位寄存器和非线性滤波函数,由反馈函数和非线性滤波函数推导出在任意时刻加密器的各自状态.采用NXP公司自带HITAG2加密算法的PCF7952单片机进行数据加密,并在Mega168上编写HITAG2加密算法软件进行算法验证.通过研究提升了该算法的应用空间.

This paper analyzed and deduced the HITAG2encryption algorithms which are commonly used in keyless entry system,and analyzed two important components of HITAG2encryption algorithm:linear feedback shift register and nonlinear filtering functions.The respective status of encryptor at any time was derived.In order to verify the correctness of this HITAG2encryption algorithm,it designed the corresponding hardware circuit,using a controller with HITAG2encryption algorithm PCF7952(manufactured by NXP)encrypted those data,and writing a software which run in the Megal28microcontroller.