适合CBTC系统无线信道加密算法

Cryptography algorithm for wireless channel of CBTC system

分析了现有地铁CBTC无线信道安全问题,针对其加密算法RC4的缺陷,提出了一种新的基于Montgomery型曲线ECC快速加密算法。与一般形式的传统的Montgomery型椭圆曲线密码相比,该算法可部分恢复y坐标的值数,具有更高的安全性。该算法与传统椭圆曲线密码相比,具有更快的计算速度并能有效地抵御时间攻击和能量攻击,从而证明了利用ECC密码体制来代替RC4密码体制的可行性。算法对提高椭圆曲线密码的在CBTC等无线通信系统的实现效率有一定意义。

As to the disadvantages of RC4 which was used for CBTC system,a new cryptography algorithm based on Montgomery-form ECC was brought forward.Compared with the traditional Montgomery elliptic curve,the improved algorithm would resume the value of y-coordinate with more security.In addition,compared with the traditional ECC,it has faster computing speed and can effectively resist the timing attack and energy attack.The new Montgomery-form ECC algorithm has accelerated current ECC encoding speed and would make great improvement to the implementation of ECC in CBTC and other wireless communication.