抗相关攻击的A5/1算法改进

Improvement of A5/1 algorithm against correlation attack

利用A5/1算法的密钥和帧序列号初始化弱点,可以用相关分析技术区分出A5/1密钥流与真随机比特序列或恢复A5/1密钥。经过对A5/1算法进行改进,可以堵塞这一漏洞,从而增强A5/1算法的安全性。

The A5/1 key-streams can be easily distinguished from the random sequences, or even the A5/1 keys can be recovered, because of the known weakness of the A5/1 algorithm. A new improved A5/1 algorithm is presented to wall up the weakness and increase security.