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口令认证由于其操作的便捷性.是现实生活中使用最为广泛的认证方式之一。传统在固定设备上使用的口令认证协议计算效率不高.无法满足可移动设备的要求。经过对前人工作的总结分析,提出一种高效且能够抵抗多种安全威胁,适于可移动设备使用的口令认证协议.并给出了安全分析。 相似文献
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基于口令的远程身份认证及密钥协商协议 总被引:6,自引:1,他引:6
基于口令的身份认证协议是研究的热点。分析了一个低开销的基于随机数的远程身份认证协议的安全性,指出了该协议的安全缺陷。构造了一个基于随机数和Hash函数、使用智能卡的远程身份认证和密钥协商协议:PUAKP协议。该协议使用随机数,避免了使用时戳带来的重放攻击的潜在风险。该协议允许用户自主选择和更改口令,实现了双向认证,有较小的计算开销;能够抵御中间人攻击;具有口令错误敏感性、口令的主机非透明性和强安全修复性;生成的会话密钥具有新鲜性、机密性、已知密钥安全性和前向安全性。 相似文献
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口令认证密钥交换协议使得仅共享低熵口令的用户可以通过不安全的信道安全地协商出高熵的会话密钥,由于实用性较强受到了密码学研究者的广泛关注。对最近在“标准模型下高效的基于口令认证密钥协商协议”一文中提出的协议以及在“基于验证元的三方口令认证密钥交换协议”一文中提出的协议进行了分析,指出这两个口令认证密钥交换协议都是不安全的,难于抵抗离线字典攻击,进一步分析了原协议设计或安全性证明中被疏忽之处。 相似文献
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匿名口令认证是近几年来的研究热点,能够有效的加强口令认证的安全性。该文在研究以往认证协议的基础上提出一种新匿名口令认证协议。该协议对用户的认证密钥进行两次分割。使用得该文提出的认证协议能够有效的抵抗离线字典攻击,并且使用该文提出的口令认证协议具有不可连接性的匿名口令认证的特点。是一种具有高安全性的认证协议。 相似文献
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针对多数口令密钥协商(PAKE)协议不具备双向认证功能的问题,基于通用可组合(UC)模型,提出一种UC安全的双向口令认证密钥协商(MPAKE)协议。定义具有双向认证功能的PAKE协议理想函数,描述实体之间的双向认证关系,并利用联合状态UC模型构造实现该理想函数的协议,使协议实体之间可以使用共享参数。该协议基于口令实现了双向认证,并能够协商出会话密钥。通过构造仿真器及其执行的操作分析MPAKE的不可区分性,从而证明该协议是UC安全的,并且结构简单,可保证在任意多方环境中并行运行时的安全。 相似文献
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目前很多认证协议用于产生动态口令的算法都是通过利用前一次认证使用的动态口令或是前一次认证使用的动态口令中的某部分认证因子作为产生后一次认证使用的动态口令的基础。这就无法完全避免两次认证使用的动态口令具有明显的相关性,从而导致协议本身容易遭受攻击。文章介绍的IFDA协议提出采用不直接作为认证口令的信息充当干扰因子以保护用户口令间接完成认证过程的新思想。 相似文献
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口令认证密钥协商使得参与通信的用户用一个低熵的口令就可以实现实体认证,并能通过不安全的信道安全地生成共享的高熵会话密钥。为此,设计了一种新的基于椭圆曲线的三方口令认证密钥协商协议,新协议将参与者的口令巧妙地隐藏在传输的消息中,确保了口令的安全性。新协议的安全性基于椭圆曲线离散对数问题,服务器并不需要完全可信。安全性分析和性能分析显示,新协议以较低的代价实现了通信双方的安全通信。 相似文献
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对于口令认证的密钥交换协议的安全性要求,提出一种口令认证的三方密钥交换协议,利用服务器存储客户端口令的验证值、双线性对与基于身份加密算法等内容进行协议的设计,并对协议进行了安全性和效率的两个方面的分析。分析表明,所提出的协议具有口令认证的三方密钥交换协议的安全属性要求,也具有较好的效率。 相似文献
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Seamless roaming over wireless network is highly desirable to mobile users, and security such as authentication of mobile users is challenging. Recently, due to tamper-resistance and convenience in managing a password file, some smart card based secure authentication schemes have been proposed. This paper shows some security weaknesses in those schemes. As the main contribution of this paper, a secure and light-weight authentication scheme with user anonymity is presented. It is simple to implement for mobile user since it only performs a symmetric encryption/decryption operation. Having this feature, it is more suitable for the low-power and resource-limited mobile devices. In addition, it requires four message exchanges between mobile user, foreign agent and home agent. Thus, this protocol enjoys both computation and communication efficiency as compared to the well-known authentication schemes. As a special case, we consider the authentication protocol when a user is located in his/her home network. Also, the session key will be used only once between the mobile user and the visited network. Besides, security analysis demonstrates that our scheme enjoys important security attributes such as preventing the various kinds of attacks, single registration, user anonymity, no password/verifier table, and high efficiency in password authentication, etc. Moreover, one of the new features in our proposal is: it is secure in the case that the information stored in the smart card is disclosed but the user password of the smart card owner is unknown to the attacker. To the best of our knowledge, until now no user authentication scheme for wireless communications has been proposed to prevent from smart card breach. Finally, performance analysis shows that compared with known smart card based authentication protocols, our proposed scheme is more simple, secure and efficient. 相似文献
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Designing an anonymous user authentication scheme in global mobility networks is a non-trivial task because wireless networks are susceptible to attacks and mobile devices powered by batteries have limited communication, processing and storage capabilities. In this paper, we present a generic construction that converts any existing secure password authen- tication scheme based on a smart card into an anonymous authentication scheme for roaming services. The security proof of our construction can be derived from the underlying password authentication scheme employing the same assumptions. Compared with the original password authentication scheme, the transformed scheme does not sacrifice the authentication effciency, and additionally, an agreed session key can be securely established between an anonymous mobile user and the foreign agent in charge of the network being visited. Furthermore, we present an instantiation of the proposed generic construction. The performance analysis shows that compared with other related anonymous authentication schemes, our instantiation is more effcient. 相似文献
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Due to the simplicity of maintaining human memorable passwords without any assistant storage device, password-based three-party encrypted key exchange (3PEKE) protocol has become one of the most promising research fields on user authentication and secure communication. In 2008, Chen et al. and Yoon and Yoo both pointed that Chang and Chang's password-based 3PEKE scheme cannot resist against undetectable on-line password guessing attacks, and then respectively proposed an improved protocol to eliminate the security vulnerability. However, based on the security analyses conducted by us, we find that both of their protocols are still vulnerable against undetectable on-line password guessing attacks. Accordingly, we develop a novel 3PEKE protocol to remedy these authentication flaws. Moreover, our proposed protocol can achieve better performance efficiency by requiring only four message transmission rounds. In conclusion, we can claim that our proposed 3PEKE protocol is more secure and efficient in comparison with the protocols proposed by Chen et al. and Yoon and Yoo. 相似文献
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口令认证密钥协商可以在客户机和服务器之间建立安全的远程通信,且可以将一个低熵口令放大为一个高熵的会话密钥。然而,随着量子计算技术的快速发展,基于大数分解和离散对数等经典数学难题的PAKA协议面临着严峻的安全挑战。因此,为了构建一个高效安全的后量子PAKA协议,依据改进的Bellare-Pointcheval-Rogaway(BPR)模型,提出了一个基于格的匿名两方PAKA协议,并且使用给出严格的形式化安全证明。性能分析结果表明,该方案与相关的PAKA协议相比,在安全性和执行效率等方面有一定优势,更适用于资源受限的物联网(Internet of Things, IoT)智能移动设备。 相似文献
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《Computer Networks》2007,51(13):3715-3726
Most users have multiple accounts on the Internet where each account is protected by a password. To avoid the headache in remembering and managing a long list of different and unrelated passwords, most users simply use the same password for multiple accounts. Unfortunately, the predominant HTTP basic authentication protocol (even over SSL) makes this common practice remarkably dangerous: an attacker can effectively steal users’ passwords for high-security servers (such as an online banking website) by setting up a malicious server or breaking into a low-security server (such as a high-school alumni website). Furthermore, the HTTP basic authentication protocol is vulnerable to phishing attacks because a client needs to reveal his password to the server that the client wants to login.In this paper, we propose a protocol that allows a client to securely use a single password across multiple servers, and also prevents phishing attacks. Our protocol achieves client authentication without the client revealing his password to the server at any point. Therefore, a compromised server cannot steal a client’s password and replay it to another server.Our protocol is simple, secure, efficient and user-friendly. In terms of simplicity, it only involves three messages. In terms of security, the protocol is secure against the attacks that have been discovered so far including the ones that are difficult to defend, such as the malicious server attacks described above and the recent phishing attacks. Essentially our protocol is an anti-phishing password protocol. In terms of efficiency, each run of our protocol only involves a total of four computations of a one-way hash function. In terms of usability, the protocol requires a user to remember only one password consisting of eight (or more) random characters, and this password can be used for all of his accounts. 相似文献
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身份认证是建立客户端和服务器之间安全会话的前提条件。Kim和Chung提出了一种双方的双向认证方案,其以较小的计算量得到了学者们的关注。但经分析发现,该方案并不安全:无法抵抗离线口令猜测攻击和无限次在线口令猜测攻击,也不能防止服务器伪装攻击。为了解决这些安全隐患,利用非对称Rabin密码体制提出了一种改进的方案,并基于BAN逻辑对方案的正确性进行了严格验证。最后还分析了新方案的安全性和性能。 相似文献
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为确保通信双方的信息安全,很多认证与密钥协商(AKA)协议被提出并应用于实际场景中。然而现有三因子协议都存在安全漏洞,如易受智能卡丢失攻击、口令猜测攻击等,有的更是忽略了匿名性。针对上述问题提出了一种三因子匿名认证与密钥协商协议。该协议通过融合智能卡、口令和生物认证技术,并增加口令与生物特征更新阶段以及智能卡更新分配阶段,并利用椭圆曲线上的计算性Diffie-Hellman(CDH)假设进行信息交互,来实现安全通信。在随机预言机模型下证明了所提协议的安全性。与同类协议进行对比分析的结果表明,所提协议能有效防范智能卡丢失攻击、重放攻击等多种攻击,实现了匿名性、口令自由更新等更全面的功能,且具有较高的计算和通信效率。 相似文献
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User authentication such as password setting has become increasingly important for the secure management of the information stored in mobile devices. However, in the password authentication schemes used in mobile devices, enhancing security reduces their usability, and passwords become hard to memorize. In addition, enhancing their usability makes them vulnerable to shoulder-surfing or recording attacks involving stealing a glance at the authentication process through the system interface. In this paper, we propose a password authentication scheme that uses a virtual scroll wheel, called WheelLock, to ensure appropriate usability and prevent brute force, shoulder-surfing, and recording attacks. 相似文献
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A cross‐realm client‐to‐client password‐authenticated key agreement (C2C‐PAKA) protocol allows network clients from different realms managed by different servers to agree on a session key in an authentic manner based on easily memorizable passwords. In this paper, we present a generic framework for constructing a cross‐realm C2C‐PAKA protocol from any secure smart card‐based password authentication (PA‐SC) protocol. The security proof of our construction can be derived from the underlying PA‐SC protocol employing the same assumptions. Our generic framework appears to be the first one with provable security. In addition, compared with similar protocols, the instantiation of our construction achieves improved efficiency. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献