对认证与密钥协商协议(UMTS AKA)中无和有序列号SQN进行了3种攻击场景模拟并得到结论:SQN的使用不能有效抵抗重放攻击.基于此,进一步分析并仿真了使用一次性随机数抵抗重放攻击的3种改进协议,结果表明:AP-AKA和基于公钥密码学的AKA能够有效抵抗重放攻击,但是AP-AKA增加了实体的存储和计算资源,基于公钥密码学的AKA增加了算法的复杂性,而S-AKA只能部分抵抗重放攻击. Three attack scenario simulations of no-and-sequence SQN in the UMTS AKA were carried out and it was concluded that the use of SQN could not effectively resist replay attack.Based on this, we further analyzed and simulated the use of one-time AP-AKA and AKA based on public-key cryptography can effectively resist the replay attack. However, AP-AKA increases the storage and computing resources of the entity. Based on the public-key cryptosystem Learning AKA increases the complexity of the algorithm while S-AKA can only partially resist replay attacks.