In this paper, a TTP-based two-party authenticated key exchange (TTP-TPAKE) protocol is proposed. It is suitable for large-scale client-to-client communication environments. This protocol can be completed in five steps and four rounds, and communicating entities can authenticate each other and establish a session key through a trusted third-party. A formal proof is presented to demonstrate the AKE security of the proposed TTP-TPAKE protocol in the ideal cipher model and random oracle model.%本文提出了一种适合大规模C2C通信环境的两方密钥交换TTP-TPAKE协议,协议中的每个通信实体和可信中心共享一个可记忆的口令,然后在该可信第三方的帮助下,每对通信实体生成他们的会话密钥.该协议只需四轮通信,不需棘手的公钥基础设施作为支撑,具有较高的计算和通信效率.在随机预言模型和理想密文系统下,形式化地证明了TTP-TPAKE协议具备AKE安全.
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