一种鲁棒的无线传感器网络用户认证方案安全性的增强

In order to remedy the security weaknesses of a robust user authentication framework for wireless sensor networks, an enhanced user authentication framework is presented. The enhanced scheme requires proof of the possession of both a password and a smart card, and provides more security guarantees in two aspects: 1) it addresses the untraceability property so that any third party accessing the communication channel cannot link two authentication sessions originated from the same user, and 2) the use of a smart card prevents offline attacks to guess passwords. The security and efficiency analyses indicate that our enhanced scheme provides the highest level of security at reasonable computational costs. Therefore, it is a practical authentication scheme with attractive security features for wireless sensor networks.     

两个多服务器架构下动态认证协议的安全性分析(英文)

Since network services are provided cooperatively by multiple servers in the lnternet, the authentication protocols for multiserver architecture are required by Internetbased services, such as online game, online trade and so on. Recently, Li et al. analyzed Lee et al.＇s protocol and proposed an improved dynamic identity based authentication protocol for multi-server architecture. They claimed that their protocol provides user＇s anonymity, mutual authentication and the session key agreement against several kinds of attacks. In this paper, a cryptanalysis on Lee et al.＇s scheme shows that Lee et al＇s protocol is also vulnerable to malicious server attack, stolen smart card attack and leak-of-verifier attack. Moreover, Li e/ al.＇s improved protocol is also vulnerable to all these attacks. Further cryptanalysis reveals that Li et al.＇s improved protocol is susceptible to collusion attack.     

Security Flaws in Authentication Protocols with Anonymity for Wireless Environments

The emerging wireless networks require the design of new authentication protocols due to their dynamic nature and vulnerable‐to‐attack structure. Recently, Wu and others proposed a wireless authentication protocol which is claimed to be an improvement of the authentication protocol proposed by Lee and others which provides user anonymity. In this letter, we show that these protocols have a common flaw and that these protocols fail to provide user anonymity. We also propose a modification method to solve this problem.     

无线传感器网络中的“双重”身份验证

如今,无线传感器网络是一种新的和有前途的下一代实时无线监控应用的解决方案。如果在考虑部署传感器网络之前没有适当的安全考虑,可以成为一个威胁。但是,如果有任何安全漏洞,即可能向攻击者敞开了大门并且危害应用。因此,用户身份验证的核心要求之一,以防止未经授权的无线传感器网络的数据访问用户。在这方面提出一个有效的双重身份验证的无线传感器网络,它是基于密码和智能卡（双重）。计划提供了相互认证,使用户能够选择和频繁地改变自己密码。再者,通过合理计算成本,提供强大的保护防止不同类型的攻击。     

基于动态ID远程用户身份认证方案的改进

对Wang提出的动态ID远程用户身份认证方案进行了回顾和分析,指出了Wang方案中存在不能保护用户匿名和不能抗拒绝服务攻击的缺陷。针对此缺陷,在保留原方案优点的基础上提出了一种改进的动态ID远程用户身份认证方案,并通过对比分析说明了改进方案的安全性和有效性。     

Cryptanalysis and security enhancement of a remote user authentication scheme using smart cards

With the broad implementations of the electronic business and government applications,robust system security and strong privacy protection have become essential requirements for remote user authentication schemes.Recently,Chen et al.pointed out that Wang et al.’s scheme is vulnerable to the user impersonation attack and parallel session attack,and proposed an enhanced version to overcome the identified security flaws.In this paper,however,we show that Chen et al.’s scheme still cannot achieve the claimed security goals and report its following problems:(1) It suffers from the offline password guessing attack,key compromise impersonation attack and known key attack;(2) It fails to provide forward secrecy;(3) It is not easily repairable.As our main contribution,a robust dynamic ID-based scheme based on non-tamper resistance assumption of the smart cards is presented to cope with the aforementioned defects,while preserving the merits of different related schemes.The analysis demonstrates that our scheme meets all the proposed criteria and eliminates several grave security threats that are difficult to be tackled at the same time in previous scholarship.     

具有不可链接性的无线通信匿名认证

客户端-服务器认证协议的匿名性指服务器能够认证客户端的真实性,但无法获知客户端的身份。针对认证协议提出了新的安全性需求—不可链接性,该性质是对匿名性的有益补充。对已有文献中的认证协议进行修正,使其在不降低认证效率的前提下满足不可链接性。修正后的方案同时提供身份保护性、不可链接性、双向认证、密钥协商、密钥更新、会话密钥的后向保密性以及客户端的口令修改功能。     

基于智能卡的轻量级非平衡型口令认证方案

智能卡与口令相结合的身份认证方式既可保留使用强密钥优势,又具有使用方便的特点,是一种理想的安全双因子认证方式。当前许多公开的口令认证方案,要么需要较强的计算环境而难于采用智能卡快速实现,要么不能抵抗离线口令猜测攻击或服务端内部攻击而存在安全缺陷。提出一种非平衡型口令认证方案,基于智能卡和用户口令双因子设计,具有简便高效、口令安全、双向认证特点,能够抵御离线口令猜测攻击和服务端内部攻击,可用于满足设备开机时的安全认证需求。     

智能卡的安全性

智能卡就是带有微处理器(CPU)电路的IC卡.随着它的普及,有关智能卡的安全性问题就提到了日程上.文中主要讲述了涉及智能卡方面的一系列的安全问题及其本身的安全性设计.     

利用Smart卡的可撤销匿名性的电子支付系统

本文对文（１）提出的利用Ｓｍａｒｔ卡的电子支付系统进行了改进,提出了一种可撤销用户匿名性的支付系统,一方面,它能有效地保护用户的隐私,另一方面,在银行的协助下,一个可信第三方（委托人）可撤销用户的匿名性。因此可有效地防止钱的伪造、含污和敲诈。     

基于无线传感器网络的双因子认证协议的设计与研究

认证技术是当今网络安全发展的一个重要方向.无线传感器网络由于结点的资源和计算能力的限制,简单有效的认证协议是其需要考虑的重要问题.然而研究发现M.L.Das和Khan的协议都有一些安全缺陷,本文提出了一种适用于无线传感器网络的双因子认证协议,并对协议进行了安全分析和性能测试.结果表明,该协议能应对多种攻击,系统安全性高.     

RFID匿名认证协议的设计

在分析RFID协议安全需求的基础上,基于通用可组合安全模型,设计了一个低成本的RFID匿名认证协议,在标准模型下证明了RFID匿名认证协议的安全性.设计的协议提供匿名、双向认证和并发安全,并且协议的实现对于一般的RFID结构都是切实可行的.