一种基于动态口令的FTP双向认证方案

FTP协议是一种简单易用的文件传输协议,应用十分广泛,但它以明文形式传输口令和文件,带有与生俱来的不安全性,随着网络的不断发展应用,FTP已成为政府机关和企事业单位传送信息的一种主要手段,以明文形式传输敏感信息,缺乏有效的身份认证以及安全传输机制等这样的隐患将会给国家和企业造成巨大的损失和危害,因此FTP通信系统的安全性研究显得尤为重要。以构建FTP安全通信系统为背景,分析了传统FTP身份认证的缺陷,对比了当前常用的认证技术。在此基础上,提出了一种结合HASH函数、对称密码机制以及挑战/应答机制的基于动态口令的双向认证方案。最后对该方案进行了性能分析。结果表明：该方案具有保护用户身份信息,防止诸如重放、假冒等常见身份认证攻击,实现双向认证的优点。     

基于事件的一次性口令双向认证的实现

针对静态口令身份认证技术易受攻击的安全缺陷,在事件同步一次性口令产生机制的基础上,结合公钥密码体制,设计并实现了一种新的一次性口令双向认证方案。与传统的挑战／响应双向认证方案相比,该方案实现简单、执行效率高,适用于电子商务过程中的身份认证,能够实现网络环境下用户和服务器的双向认证,避免各种攻击,可以大大提高用户访问的安全性,有效保护用户信息。     

基于手机令牌的移动应用双向身份认证方案研究

随着移动信息化的发展,移动应用的安全问题已成为用户关注的焦点。身份认证存在多种解决方案,其中动态口令技术是目前身份认证问题的最有效解决方案。在分析目前动态口令存在缺陷的基础上,提出了一种改进的基于手机令牌的挑战/应答动态口令身份认证方案,它以指纹作为令牌使用凭证,能双向可信认证,并以分段双通道方式进行加密通信。此外,对新方案进行了安全性分析。分析结果表明该方案具有安全性高、使用简便、成本低的特点,完全满足移动应用通信中安全级别较高的身份认证要求。     

不依赖于第三方的动态量子身份认证方案

提出了一个量子身份认证方案,该方案仅在注册时需要认证中心,以后不再依赖于任何第三方.在方案的实施过程中采用一种动态方式,即合法通信者之间每次可动态获得一个新的认证密钥.所提方案具有可证明安全性,安全性由量子不可克隆性和方案本身的动态特性保证.     

基于TPM的云计算平台双向认证方案

为了解决云计算服务环境中用户和云服务器之间的双向认证问题,提出一种基于可信平台模块的云计算平台双向认证方案。将可信计算技术和传统的智能卡口令认证方法相结合应用于云计算服务平台,实现云计算中双方身份的认证,协商生成会话密钥,同时对云服务器的平台可信状况进行了验证。实验分析表明,该方案可以抵抗常见的各种攻击,安全性较高。计算时间复杂度在云计算服务中能够满足要求。     

基于票据的名字解析系统切换认证机制

名字解析系统作为信息中心网络的重要组成部分,负责建立、维护和发布信息名字和地址之间的映射关系,提供名字解析服务。移动节点在使用名字解析系统服务时,存在代理之间切换认证的场景。针对该场景简单性、高效性和安全性的要求,结合无线网络中的切换认证机制,提出一种基于票据的名字解析系统切换认证机制。移动节点利用认证服务器预签名的票据进行接入认证,之后使用原代理分发的票据进行切换认证。认证过程减少移动节点计算量大的操作和认证双方交互次数。移动节点分别通过四次通信和二次通信完成接入认证和切换认证。分析表明该机制不仅具有多种安全特性如隐私保护、双向认证、前向和后向安全性、抵抗重放攻击和伪造攻击,而且计算代价减少48%,通信开销降低至少25%。     

异构云匿名身份认证方案设计

针对异构云间资源互访、信息交互的需求,提出了一种基于双线性映射和身份密码体制的异构云匿名身份认证协议.该协议避免了传统认证协议建立和维护证书的繁琐弊端,实现了异构云间双向实体认证和资源访问主体匿名性.通过认证过程的鉴别验证和设置身份期限,既保障了认证安全性、密钥新鲜性,又减少了频繁异构云服务申请的过渡认证开销.通过分析对比,协议具有安全高效的特点,能满足异构云间用户数量众多、服务访问频繁的认证需求.     

基于量子特性的身份认证

利用量子特性实现量子保密通信是目前量子信息学界和密码学界关注的热点问题之一,文章根据利用量子特性提出了一个量子身份认证方案,实现了通信中通信双方的身份认证.该方案实施申采用了动态工作方式,易于实现,具有可证明安全性.     

一种RFID隐私保护双向认证协议

作为一种非接触式自动识别技术,RFID在带来成本节约和效率提高的同时,也带来了安全和隐私的风险。为保证安全性和隐私性,必须对阅读器和标签之间的通信提供认证和保护,对现有的RFID安全性和隐私性解决方案进行了简要分析,之后应用零知识思想,提出了一种基于单向Hash函数的双向RFID认证协议,并分析了其安全性和抗攻击性。     

改进的基于自更新哈希链的认证方案

针对一些节点计算能力、通信带宽等资源受限的分布式自组网,文中介绍了几种常见的认证思想,并分析了它们的优缺点及适用性。通过采用自更新哈希链和对称密钥技术,提出一种改进的基于自更新哈希链的双向认证密钥协商方案。分析表明,该方案不仅具有较高的安全性能,而且避免了传统非对称算法的复杂运算,只进行简单的哈希哈数和对称密钥算法,大大减少了节点的计算和通信开销,在一定程度上满足资源受限网络的认证需求。     

基于消息认证函数的云端数据完整性检测方案

针对云计算中数据完整性问题,该文提出了一个新的交互式完整性检测方案.该方案通过构造一个I型完善Cartesian消息认证函数及其等效函数,在同步存储数据验证值的前提下,利用等效函数判定云端应答的消息认证值来检测完整性.分析结果表明,该方案在大数分解的困难性假设下能正确检测完整性,并且运行时仅需用户端常量的计算量、存储占用量和网络通信量,相比较现有方案,具有明显效率优势.     

Provable data possession scheme based on public verification and private verification

More and more users choose to transfer their applications and data into the cloud.Data security is a key issue for cloud storage systems.To ensure the integrity and validity of the data stored in the cloud,provable data possession (PDP) scheme is particularly important.In order to verify whether the cloud storage service provider had stored the data of the user completely,a scheme on the basis of NRPDP (non-repudiable PDP) was improved and extended,and a data retention scheme based on public authentication and private authentication was proposed.The scheme can verify the trustworthiness of the service provider and the user in the cloud storage at the same time,which satisfies the non-repudiation of the verification.The theory proves the non-repudiation of the proposed scheme.The experiment proves that the efficiency of each stage is better than that of the existing single public verification method or private authentication method.     

Authentication scheme for multi-cloud environment based on smart card

To solve the problem of the access keys stored in a smart card increasing linearly with the number of registered clouds without third party participated in authentication,an authentication scheme was proposed for multi-cloud environment based on smart card.In the proposed scheme,the authentication was realized between user and multiple clouds without third party participation when the smart card only stored two access key.Thus the storage cost of smart card was reduced effectively.Because there was no public key cryptography,the authentication messages was generated by using XOR homomorphic function and Hash function,thus the computational cost of the smart card and the cloud servers was reduced effectively.Moreover,the proposed scheme also didn’t need to store any user’s information on the cloud servers,thereby reducing the storage and management costs of the cloud servers.The security analysis and the performance analysis show that the proposed scheme is able to resist multiple attacks,which is secure and efficient.     

A simplified deniable authentication scheme in cloud‐based pay‐TV system with privacy protection

Cloud computing is a milestones for computing model, which enables on‐demand, flexible, and low‐cost usage of computing resources, especially for cloud storage. Nowadays, the services of cloud‐based pay‐TV systems are emerging endlessly. But these pay‐TV systems' privacy is not given enough attention. The users not only care about their information revealed during transmission processes but are also concerned about whether the video contents that they have seen were recorded by the pay‐TV systems or not. In this work, I propose a novel deniable authentication protocol in a cloud‐based pay‐TV system, named DAP‐TV, aiming to achieve mutual authentication, deniability, and privacy protection in cloud‐based pay‐TV systems. The unique feature of our scheme is deniability which means a pay‐TV system to identify a user is a legal user, but the pay‐TV system cannot prove video contents that the user has seen to any third party over an unsecured network. In additon, our scheme is based on chaotic maps, which is a highly efficient cryptosystem and is firstly used to construct a deniable authentication scheme in pay‐TV systems. Finally, we give the formal security proof and efficiency comparison with recently related works.     

Prediction-based secured handover authentication for mobile cloud computing

Mobile cloud computing (MCC) is a new technology that brings cloud computing and mobile networks together. It enhances the quality of service delivered to mobile clients, network operators, and cloud providers. Security in MCC technology, particularly authentication during the handover process, is a big challenge. Current vertical handover authentication protocols encounter different problems such as undesirable delays in real-time applications, the man in the middle attack, and replay attack. In this paper, a new authentication protocol for heterogeneous IEEE 802.11/LTE-A mobile cloud networks are proposed. The proposed protocol is mainly based on the view of the 3GPP access network discovery and selection function, which uses the capacities given by the IEEE 802.11 and the 3GPP long term evolution-advanced (LTE-A) standards interconnection. A prediction scheme, with no additional load over the network, or the user is utilized to handle cloud computing issues arising during authentication in the handover process. The proposed handover authentication protocol outperformed existing protocols in terms of key confidentiality, powerful security, and efficiency which was used to reduce bandwidth consumption.

     

Secure communication in CloudIoT through design of a lightweight authentication and session key agreement scheme

Internet of Things (IoT) is a newly emerged paradigm where multiple embedded devices, known as things, are connected via the Internet to collect, share, and analyze data from the environment. In order to overcome the limited storage and processing capacity constraint of IoT devices, it is now possible to integrate them with cloud servers as large resource pools. Such integration, though bringing applicability of IoT in many domains, raises concerns regarding the authentication of these devices while establishing secure communications to cloud servers. Recently, Kumari et al proposed an authentication scheme based on elliptic curve cryptography (ECC) for IoT and cloud servers and claimed that it satisfies all security requirements and is secure against various attacks. In this paper, we first prove that the scheme of Kumari et al is susceptible to various attacks, including the replay attack and stolen-verifier attack. We then propose a lightweight authentication protocol for secure communication of IoT embedded devices and cloud servers. The proposed scheme is proved to provide essential security requirements such as mutual authentication, device anonymity, and perfect forward secrecy and is robust against security attacks. We also formally verify the security of the proposed protocol using BAN logic and also the Scyther tool. We also evaluate the computation and communication costs of the proposed scheme and demonstrate that the proposed scheme incurs minimum computation and communication overhead, compared to related schemes, making it suitable for IoT environments with low processing and storage capacity.     

Secure Data Access and Sharing Scheme for Cloud Storage

Cloud storage is a new storage mode emerged along with the development of cloud computing paradigm. By migrating the data to cloud storage, the consumers can be liberated from building and maintaining the private storage infrastructure, and they can enjoy the data storage service at anywhere and anytime with high reliability and a relatively low cost. However, the security and privacy risks, especially the confidentiality and integrity of data seem to be the biggest hurdle to the adoption of the cloud storage applications. In this paper, we consider the secure data access and sharing issues for cloud storage services. Based on the intractability of the discrete logarithm problem, we design a secure data access and data sharing scheme for cloud storage, where we utilize the user authentication scheme to deal with the data access problem. According to our analysis, through our scheme, only valid user with the correct password and biometric can access to the cloud storage provider. Besides, the authorized users can access the rightful resources and verify the validity of the shared data, but cannot transfer the permission to any other party. At the same time, the confidentiality and integrity of data can be guaranteed.

     

基于Ceph对象存储的云网盘设计与实现

针对基于传统NAS存储实现云网盘存在扩展性差,响应性能低、数据不可靠性、安全性低等问题,提出一种基于Ceph分布式对象存储系统构建高性能、高可靠、可扩展的云网盘设计与实现方案,底层基于X86服务器作为Ceph存储集群池,通过设计多对象网关发布对象存储服务,采用软负载均衡,提升云网盘请求响应吞吐能力,并集成基于Token认证系统实现对象数据的隔离与安全。经实验测试表明,该设计实现方案可满足现实应用需求。     

A certificateless signcryption with proxy re-encryption for practical access control in cloud-based reliable smart grid

Cloud computing has proven to be applicable in smart grid systems with the help of the cloud-based Internet of things (IoT) technology. In this concept, IoT is deployed as a front-end enabling the acquisition of smart grid-related data and its outsourcing to the cloud for data storage purposes. It is obvious that data storage is a pertinent service in cloud computing. However, its wide adoption is hindered by the concern of having a secure access to data without a breach on confidentiality and authentication. To address this problem, we propose a novel data access control scheme that simultaneously accomplishes confidentiality and authentication for cloud-based smart grid systems. Our scheme can enable the storing of encrypted smart grid-related data in the cloud. When a user prefers to access the data, the data owner issues a delegation command to the cloud for data re-encryption. The cloud is unable to acquire any plaintext information on the data. Only authorized users are capable of decrypting the data. Moreover, the integrity and authentication of data can only be verified by the authorized user. We obtain the data access control scheme by proposing a pairing free certificateless signcryption with proxy re-encryption (CLS-PRE) scheme. We prove that our CLS-PRE scheme has indistinguishability against adaptive chosen ciphertext attack under the gap Diffie–Hellman problem and existential unforgeability against adaptive chosen message attack under elliptic curve discrete logarithm problem in the random oracle model.

     

ACDAS: Authenticated controlled data access and sharing scheme for cloud storage

Cloud storage services require cost‐effective, scalable, and self‐managed secure data management functionality. Public cloud storage always enforces users to adopt the restricted generic security consideration provided by the cloud service provider. On the contrary, private cloud storage gives users the opportunity to configure a self‐managed and controlled authenticated data security model to control the accessing and sharing of data in a private cloud. However, this introduces several new challenges to data security. One critical issue is how to enable a secure, authenticated data storage model for data access with controlled data accessibility. In this paper, we propose an authenticated controlled data access and sharing scheme called ACDAS to address this issue. In our proposed scheme, we employ a biometric‐based authentication model for secure access to data storage and sharing. To provide flexible data sharing under the control of a data owner, we propose a variant of a proxy reencryption scheme where the cloud server uses a proxy reencryption key and the data owner generates a credential token during decryption to control the accessibility of the users. The security analysis shows that our proposed scheme is resistant to various attacks, including a stolen verifier attack, a replay attack, a password guessing attack, and a stolen mobile device attack. Further, our proposed scheme satisfies the considered security requirements of a data storage and sharing system. The experimental results demonstrate that ACDAS can achieve the security goals together with the practical efficiency of storage, computation, and communication compared with other related schemes.