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Universally Composable Three-Party Password Authenticated Key Exchange

机译:通用组合的第三方密码验证密钥交换

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Three-party password authenticated key exchange (3PAKE) allows two clients, each sharing a password with a trusted server, to establish a session key with the help of the server. It is a quite practical mechanism for establishing secure channels in large communication network. However, most current 3PAKE protocols are analyzed in security models that don't adequately address protocol composition problem. In this paper, a direct definition of security for 3PAKE within the universal composability framework is proposed, which captures the basic security requirements of the problem and is proven to be stronger than the commonly used security notions. To further justify our formulation of 3PAKE, we prove that a slight variant of a generic 3PAKE protocol by Wang and Hu securely realizes the new security definition.
机译:三方密码验证密钥交换(3PAKE)允许两个客户端(分别与受信任的服务器共享一个密码)在服务器的帮助下建立会话密钥。这是在大型通信网络中建立安全通道的相当实用的机制。但是,目前大多数3PAKE协议都是在安全模型中进行分析的,因此无法充分解决协议组成问题。在本文中,提出了在通用可组合性框架内3PAKE的安全性的直接定义,该定义捕获了问题的基本安全性要求,并被证明比常用的安全性概念强。为了进一步证明我们制定3PAKE的合理性,我们证明了Wang和Hu通用3PAKE协议的微小变体可以安全地实现新的安全性定义。

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