密码学中口令验证方案的设计研究

在介绍基于拉格朗日插值公式的口令验证方案的基础上,提出了2种新的改进的基于多项式的口令验证方案,适应于当今系统网络成员不断变化的情况。最后提出一种基于公钥密码和中国剩余定理的动态口令验证方案,进行方案安全性及性能的分析。     

一种基于口令验证的HTML5微场景安全预览方案及制作发布系统

随着移动互联网的快速发展和普及,微场景已经成为企业或个人展示、推广自身产品及服务的重要手段。为了满足用户对于微场景的安全、私密预览及传播的需求,本文提出了一种基于口令验证的HTML5微场景安全预览方案及制作发布系统。本文在介绍我们的微场景制作和发布系统的基础上,详细介绍了基于口令验证的HTML5微场景安全预览方案的实现过程及优势。     

计算机网络中用户访问能力的监测与控制

提出了一个新的口令认证方案,利用此方案,计算机系统不仅能验证口令的正确性,而且可以利用口令确认用户访问系统的次数,并且这种监控具有可认证性和可仲裁性。     

基于孙子定理的口令验证方案

提出了一种基于孙子定理的口令 验证方案。介绍了它的具体实现过程，并进行了性能分析，指出了它的优点。     

后量子基于验证元的三方口令认证密钥交换协议

针对服务器直接以明文的方式存储口令,存在服务器泄露的风险,基于两方的基于格的口令认证密钥交换(PAKE)协议不适用于大规模通信系统的问题,提出了一种格上基于验证元的三方口令认证密钥交换协议.通过随机口令哈希方案生成验证元,并结合口令策略检查机制实现口令的检查,利用基于格的CCA安全公钥加密体制构造一个新的基于验证元的3...     

一种智能卡口令认证方案的分析与改进

袁,吕提出了一种智能卡口令认证方案.在他们的方案中,用户能随意更改口令,远程系统不需要存储用户的口令表或验证表,并能防止重放攻击.作者指出袁-吕方案不能抵抗假冒攻击,并进行了改进.     

一种增强的智能卡口令鉴别方案

分析了Zhang等提出的身份鉴别方案,指出了其不能抵抗离线口令猜测攻击,以及在登录阶段和验证阶段存在设计缺陷等问题.然后在保留其优点的基础之上,通过引入随机数和增加登录请求信息的方法,提出了一种更加安全可靠的口令认证协议方案.安全性分析结果表明,该方案能够有效抵抗离线口令猜测攻击和假冒攻击,可以实现双向鉴别等特点,增强了系统的安全性和实用性.     

基于加密短信动态口令的安全网银支付方案研究

首先介绍目前网银支付的发展现状和未解决问题,进而提出基于加密短信动态口令的网银支付方案,最后将加密短信动态口令的网银支付方案与原有网银支付机制进行了对比,并指出该方案的优势.     

口令的安全与加密保护

从应用的角度看,计算机数据安全保护的第一关就是对用户的身份鉴别。采用对用户的口令鉴别验证是最为方便的一种。然而人们由于不了解口令本身所存在的固有弱点和非法入侵者对口令攻击所采用的诸多方法而盲目乐观。本文分析了口令结构的内在矛盾并针对危及口令安全的几个方面推出了适应不同层次需要的加密方案。其中为对付高技术的、精通DBMS和操作系统的入侵者所采取的措施尤其值的注意和进一步探讨。     

一种基于智能卡的有效远程双向鉴别方案

提出了一种基于智能卡的有效远程双向身份鉴别方案。用户可自由地选择和改变登录口令,无需维护口令目录表或验证表。此外,该方案不仅能够提供通信双方的相互鉴别,而且引入质询随机数代替时间戳,既可保证每次身份鉴别信息的随机性,有效防止重放攻击,又避免了复杂的时间同步问题,极大地增强了应用系统的安全性和实用性。     

一种改进的动态ID远程用户身份认证方案

由于网络安全的需要,利用智能卡的双因子身份鉴别方案越来越受到重视。首先分析了Wang Yan-yan等人提出的基于动态ID的远程用户身份认证方案的安全性,指出其方案的安全缺陷是不能抵抗离线的口令猜测攻击;随后提出了一种改进的方案,改进之后的方案能有效抵抗重放攻击、离线口令猜测攻击、假冒服务器/用户攻击。经过安全分析,新的方案在保留了原方案优点的同时,具有了更高的安全性。     

基于阈下信道技术的身份认证机制研究

在阈下信道和非对称加密技术的基础上，提出了一种新的口令身份认证方案。对该认证机制的安全性进行了研究，分析表明它能抵抗常见类型的攻击。该项技术可用于保障口令身份认证的安全性。     

基于电子钥匙的双向身份鉴别方案

通过改进鉴别方案的安全策略和身份鉴别信息,提出了一种基于USB Key的可有效对抗离线口令猜测攻击和内部攻击的改进方案。安全性分析表明,改进后的方案保持了非存储数据型鉴别方案特点,且没有增加计算代价,具有更好的安全性和实用性。     

基于生物特征和混沌映射的多服务器身份认证方案

基于密码的用户远程认证系统已被广泛应用,近年来的研究发现,单一口令系统容易遭受字典分析、暴力破解等攻击,安全性不高.生物特征与密码相结合的认证方式逐渐加入远程认证系统中,以提高认证系统的安全水平.但现有认证系统通常工作在单一服务器环境中,扩展到多服务器环境中时会遇到生物特征模板和密码容易被单点突破、交叉破解的问题.为了克服以上问题,提出了一种基于生物特征和混沌映射的多服务器密钥认证方案,该方案基于智能卡、密码和生物特征,可明显提高多服务器身份认证系统的安全性及抗密码猜解的能力.     

Improvement of robust smart‐card‐based password authentication scheme

Smart‐card‐based password authentication scheme is one of the commonly used mechanisms to prevent unauthorized service and resource access and to remove the potential security threats over the insecure networks and has been investigated extensively in the last decade. Recently, Chen et al. proposed a smart‐card‐based password authentication scheme and claimed that the scheme can withstand offline password guessing attacks even if the information stored in the smart card is extracted by the adversary. However, we observe that the scheme of Chen et al. is insecure against offline password guessing attacks in this case. To remedy this security problem, we propose an improved authentication protocol, which inherits the merits of the scheme of Chen et al. and is free from the security flaw of their scheme. Compared with the previous schemes, our improved scheme provides more security guarantees while keeping efficiency. Copyright © 2013 John Wiley & Sons, Ltd.     

Secure Remote User Mutual Authentication Scheme with Key Agreement for Cloud Environment

Authentication schemes are widely used mechanisms to thwart unauthorized access of resources over insecure networks. Several smart card based password authentication schemes have been proposed in the literature. In this paper, we demonstrate the security limitations of a recently proposed password based authentication scheme, and show that their scheme is still vulnerable to forgery and offline password guessing attacks and it is also unable to provide user anonymity, forward secrecy and mutual authentication. With the intention of fixing the weaknesses of that scheme, we present a secure authentication scheme. We show that the proposed scheme is invulnerable to various attacks together with attacks observed in the analyzed scheme through both rigorous formal and informal security analysis. Furthermore, the security analysis using the widely-accepted Real-Or-Random (ROR) model ensures that the proposed scheme provides the session key (SK) security. Finally, we carry out the performance evaluation of the proposed scheme and other related schemes, and the result favors that the proposed scheme provides better trade-off among security and performance as compared to other existing related schemes.

     

A new three-factor authentication and key agreement protocol for multi-server environment

Several password and smart-card based two-factor security remote user authentication protocols for multi-server environment have been proposed for the last two decades. Due to tamper-resistant nature of smart cards, the security parameters are stored in it and it is also a secure place to perform authentication process. However, if the smart card is lost or stolen, it is possible to extract the information stored in smart card using power analysis attack. Hence, the two factor security protocols are at risk to various attacks such as password guessing attack, impersonation attack, replay attack and so on. Therefore, to enhance the level of security, researchers have focused on three-factor (Password, Smart Card, and Biometric) security authentication scheme for multi-server environment. In existing biometric based authentication protocols, keys are generated using fuzzy extractor in which keys cannot be renewed. This property of fuzzy extractor is undesirable for revocation of smart card and re-registration process when the smart card is lost or stolen. In addition, existing biometric based schemes involve public key cryptosystem for authentication process which leads to increased computation cost and communication cost. In this paper, we propose a new multi-server authentication protocol using smart card, hash function and fuzzy embedder based biometric. We use Burrows–Abadi–Needham logic to prove the correctness of the new scheme. The security features and efficiency of the proposed scheme is compared with recent schemes and comparison results show that this scheme provides strong security with a significant efficiency.

     

Threshold password authentication against guessing attacks in Ad hoc networks

Password authentication has been accepted as one of the commonly used solutions in network environment to protect resources from unauthorized access. The emerging mobile Ad hoc network, however, has called for new requirements for designing authentication schemes due to its dynamic nature and vulnerable-to-attack structure, which the traditional schemes overlooked, such as availability and strong security against off line guessing attacks in face of node compromise. In this paper, we propose a threshold password authentication scheme, which meets both availability and strong security requirements in the mobile Ad hoc networks. In our scheme, t out of n server nodes can jointly achieve mutual authentication with a registered user within only two rounds of message exchanges. Our scheme allows users to choose and change their memorable password without subjecting to guessing attacks. Moreover, there is no password table in the server nodes end, which is preferable since mobile nodes are usually memory-restricted devices. We also show that our scheme is efficient to be implemented in mobile devices.     

基于动态ID的远程用户身份认证方案的改进

分析了Das, Saxena和Gulati提出的一种基于动态ID的远程用户身份认证方案的安全性,指出了此方案的安全缺陷.在保留原方案优点的基础上提出了一些改进措施,验证结果表明:改进措施提高了方案的安全性和实用性.