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本文详细分析了文献［１］中ＭＳＲ＋ＤＨ方案的安全性，指出了该方案的不安全性：无法防止基地站的操作人员假冒合法用户进行的主动攻击。本文利用Ｒａｂｉｎ公钥密码体制，重新设计了一个新的身份认证和密钥分配方案，该方案在安全性和实现复杂度方面均优于ＭＳＲ＋ＤＨ方案。
This paper analyzes in detail the security of the MSR + DH solution in [1], and points out the unsafeness of this solution: it can not prevent the base station operators from taking the initiative to impersonate the legitimate users. In this paper, a new authentication and key distribution scheme is redesigned using Rabin public key cryptosystem. This scheme outperforms the MSR + DH scheme in both security and implementation complexity.