标准模型下高效的基于口令认证密钥协商协议  

Efficient Password-Based Authenticated Key Exchange Protocol under Standard Model

作　　者：舒剑[1,2] 许春香[1] 

机构地区：[1]电子科技大学计算机科学与工程学院,成都610054 [2]江西财经大学电子商务系,南昌330013

出　　处：《电子与信息学报》2009年第11期2716-2719,共4页Journal of Electronics & Information Technology

基　　金：国家"863"计划项目(2009AA012415)资助课题

摘　　要：基于口令的认证密钥协商协议是利用预先共享的口令协商安全性较高的密钥。现有的基于口令认证密钥协商协议大多需要较大的计算量,或者只在随机预言模型下证明了协议的安全性。该文提出了新的标准模型下基于口令密钥协商协议,协议只需要一个生成元。与其它标准模型下的协议相比,新协议不需要CPA或CCA2安全的加密方案,因而具有计算复杂度低和协议描述简单的特点。相对于殷胤等人在"标准模型下可证安全的加密密钥协商协议"一文中提出的协议,新协议将指数运算降低了64%。最后,基于DDH假设,在标准模型下证明了协议的安全性。The goal of password-based authenticated exchange protocol is established secure key by using preshared human-memorable password.Most of existing schemes either have computation burden or rely on the random oracle model.A new scheme without random oracles is proposed,which requires only one generator.Due to not using CPA or CCA2 public encryption scheme,the proposed protocol is efficient in computational cost and simple in protocol description when compared other solutions without random oracles.Specifically,this protocol reduces 64% of the exponential computations of the protocol proposed by Yin Yin et al.in the paper of ＂Provable secure encrypted key exchange protocol under standard model＂.The security of the proposed scheme has been proven in the standard model under DDH assumption.

关 键 词：身份认证 基于口令 标准模型 可证安全 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]