中文摘要：

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。

英文摘要：

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.