Identity-based key agreement and encryption for wireless sensor networks

1 Introduction WSN has received considerable attention during last decade [1?4] (see, for example, the proceedings of the ACM and IEEE Workshops on WSN). It has wide variety of applications, including military sensing and tracking, environment and securit…     

Privacy preserving ciphertext-policy attribute-based broadcast encryption in smart city

With the development and application of information technology, the problem of personal privacy leakage is becoming more and more serious. Most attribute-based broadcast encryption (ABBE) schemes focus on data security, while ignoring the protection of the personal privacy of users in access structure and identity. To address this problem, a privacy preserving ABBE scheme is proposed, which ensures the data confidentiality and protects personal privacy as well. In addition, the authenticity of encrypted data can be verified. It is proved that the proposed scheme achieves full security by dual system encryption.     

云计算环境中支持隐私保护的数字版权保护方案简

针对云计算环境中数字内容安全和用户隐私保护的需求,提出了一种云计算环境中支持隐私保护的数字版权保护方案。设计了云计算环境中数字内容版权全生命周期保护和用户隐私保护的框架,包括系统初始化、内容加密、许可授权和内容解密4个主要协议;采用基于属性基加密和加法同态加密算法的内容加密密钥保护和分发机制,保证内容加密密钥的安全性;允许用户匿名向云服务提供商订购内容和申请授权,保护用户的隐私,并且防止云服务提供商、授权服务器和密钥服务器等收集用户使用习惯等敏感信息。与现有的云计算环境中数字版权保护方案相比,该方案在保护内容安全和用户隐私的同时,支持灵活的访问控制,并且支持在线和超级分发应用模式,在云计算环境中具有较好的实用性。     

大数据安全背景下密码技术探讨

随着信息技术的发展,目前社会已经进入了大数据时代。大数据使得人们的生活更加方便,国家、社会各领域、各行业的发展中发挥了巨大的推动作用。但是,随之而来的是用户个人隐私泄露问题,在一定程度上,与社会、军事、政治安全也具有密切关联。因此,文章对大数据背景下的安全风险进行分析,与可搜索加密、安全多方计算、同态加密等技术结合,对基于大数据背景的密码领域展开探讨,可为相关工作的开展提供参考。     

保护用户隐私的数据加密与安全存储方案

文中提出了一套保护用户隐私的数据加密与安全存储方案,选择了适合的加密算法和密钥管理方案。通过对比分析不同加密算法的安全性和效率,最终选择了AES 256,RSA等加密算法,并设计了三级密钥管理方案,实现了对密钥的安全存储和分发。在数据存储方面,以eMMC存储器为存储介质,实现了基于角色和权限的访问控制机制,确保用户只能访问其被授权的数据。     

基于身份加密的无线传感器网络密钥分配方法

由于无线传感器网络在电源、计算能力和内存容量等方面的局限性,传统的网络密钥分配和管理方法已不适用.本文从基于身份密钥体系出发,提出了一种适用于无线传感器网络的密钥预分配方法.首先简要介绍了身份密钥体系,特别是Boneh-Franklin算法,然后基于身份密钥系统和Diffie-Hellman算法,给出我们的密钥分配方法,并从方法的复杂性、安全性、健壮性和内存需求等方面,与随机算法等进行了分析比较,结果表明我们的算法在这些方面有一定的优势.最后我们讨论了可进一步研究的内容.     

基于属性密码体制的区块链安全技术研究进展

区块链是一种集合了分布式存储、点对点传输、共识机制、密码学算法和智能合约等关键技术的分布式账本,具有去中心化、不可篡改、透明化等特性.近年来区块链技术的安全性问题逐渐显露,阻碍了区块链应用的发展.本文介绍了区块链的基本概念与安全模型,分析了区块链的安全性问题;然后,基于属性密码体制,从访问控制、密钥管理、数据隐私保护这...     

基于SM4轮函数设计的认证加密算法

认证加密算法,作为一种对称密码算法,能够同时保护数据的机密性和完整性,在信息安全领域有着重要作用.现有的认证加密算法大多是基于分组密码的工作模式设计的,底层需要调用全轮的分组密码,效率受到很大限制.本文主要考虑从基本部件出发直接设计一个高效的认证加密算法.首先结合国产分组密码标准SM4与广义Feistel结构给出了一种通用的结构设计.然后以抵抗碰撞攻击为安全性目标,利用混合整数规划（MILP）方法搜索得到了一些状态大小和效率各不相同的结构,这些结构可以被用来构造消息认证码和认证加密算法.最后,利用目前搜索得到的状态大小和效率较优的结构设计了一个认证加密算法,并进行了初步的安全性分析和软件实现,其速度约为SM4-GCM速度的10倍.     

基于云存储的文件共享策略研究

云存储具有高可扩展性、低成本等特点,为用户文件共享提供了经济高效的服务,同时也带来了新的安全问题:在不可信的云存储中,如何在保证文件的安全和隐私的前提下,为特定用户共享。该方案提出了基于身份的公钥密码体制基础上,运用高效安全的代理环签名、动态广播加密和双线性对技术,通过授权用户列表,能动态加入和撤销共享用户,不需要更改老用户相关密钥。该方案简单可行,具有可追溯性、匿名性、不可伪造性等特点。     

具有隐私保护的云存储访问控制方案

针对传统的访问控制方案无法在云计算环境下保护用户的属性隐私,提出了具有隐私保护的云存储访问控制方案。采用混合加密体制实现了数据的机密性,即利用对称密钥加密明文数据,再利用公钥密码体制对对称密钥进行加密。在新的访问控制方案中,公钥加密采用了匿名的密文策略下基于属性的加密技术。安全性分析表明,新方案在保护用户属性隐私的同时,达到了选择明文安全性,可抵抗恶意用户及云存储服务器的合谋攻击。     

SecCloudSharing: Secure data sharing in public cloud using ciphertext‐policy attribute‐based proxy re‐encryption with revocation

An efficient cryptography mechanism should enforce an access control policy over the encrypted data to provide flexible, fine‐grained, and secure data access control for secure sharing of data in cloud storage. To make a secure cloud data sharing solution, we propose a ciphertext‐policy attribute‐based proxy re‐encryption scheme. In the proposed scheme, we design an efficient fine‐grained revocation mechanism, which enables not only efficient attribute‐level revocation but also efficient policy‐level revocation to achieve backward secrecy and forward secrecy. Moreover, we use a multiauthority key attribute center in the key generation phase to overcome the single‐point performance bottleneck problem and the key escrow problem. By formal security analysis, we illustrate that our proposed scheme achieves confidentiality, secure key distribution, multiple collusions resistance, and policy‐ or attribute‐revocation security. By comprehensive performance and implementation analysis, we illustrate that our proposed scheme improves the practical efficiency of storage, computation cost, and communication cost compared to the other related schemes.     

A secure channel code‐based scheme for privacy preserving data aggregation in wireless sensor networks

Data aggregation is an efficient method to reduce the energy consumption in wireless sensor networks (WSNs). However, data aggregation schemes pose challenges in ensuring data privacy in WSN because traditional encryption schemes cannot support data aggregation. Homomorphic encryption schemes are promising techniques to provide end to end data privacy in WSN. Data reliability is another main issue in WSN due to the errors introduced by communication channels. In this paper, a symmetric additive homomorphic encryption scheme based on Rao‐Nam scheme is proposed to provide data confidentiality during aggregation in WSN. This scheme also possess the capability to correct errors present in the aggregated data. The required security levels can be achieved in the proposed scheme through channel decoding problem by embedding security in encoding matrix and error vector. The error vectors are carefully designed so that the randomness properties are preserved while homomorphically combining the data from different sensor nodes. Extensive cryptanalysis shows that the proposed scheme is secure against all attacks reported against private‐key encryption schemes based on error correcting codes. The performance of the encryption scheme is compared with the related schemes, and the results show that the proposed encryption scheme outperforms the existing schemes.     

移动社交网络多密钥混淆的交友隐私保护方案研究

在移动社交网络中,为保证交友匹配过程中用户的隐私,提出多密钥混淆隐私保护方案.利用代理重加密技术,对用户密钥密文进行重新加密,实现了以扩充交友访问策略条件的交友匹配,并保证密文转换过程中用户的隐私不被泄露;利用随机密文组件加密技术,实现了对真实明文对应加密文件的信息隐藏,提高了攻击者的破解难度;利用数据摘要签名技术,解决了以往方案未考虑的多加密文件对应的文件解密问题.安全和实验分析表明,本文方案可以达到CPA（Chosen Plaintext Attack）安全,可以保证交友用户的隐私不被泄露,并且比既有的方案更有效.     

A security protocol for RFID traceability

Nowadays, traceability represents a key activity in many sectors. Many modern traceability systems are based on radio‐frequency identification (RFID) technology. However, the distributed information stored on RFID tags involves new security problems. This paper presents the traceability multi‐entity cryptography, a high‐level data protection scheme based on public key cryptography that is able to protect RFID data for traceability and chain activities. This scheme is able to manage entities with different permissions, and it is especially suitable for applications that require complex Information Systems. Traceability multi‐entity cryptography avoids industrial espionage, guarantees the information authenticity, protects the customer privacy, and detects malicious alterations of the information. In contrast to the state‐of‐the‐art RFID security schemes, the proposed protocol is applicable to standard RFID tags without any cryptographic capability, and it does not require a central database. Copyright © 2016 John Wiley & Sons, Ltd.     

一个抗量子密钥交换协议及其对应的加密方案(英文)

The emergence of quantum computer will threaten the security of existing public-key cryptosystems,including the Diffie Hellman key exchange protocol,encryption scheme and etc,and it makes the study of resistant quantum cryptography very urgent.This motivate us to design a new key exchange protocol and encryption scheme in this paper.Firstly,some acknowledged mathematical problems was introduced,such as ergodic matrix problem and tensor decomposition problem,the two problems have been proved to NPC hard.From the computational complexity prospective,NPC problems have been considered that there is no polynomial-time quantum algorithm to solve them.From the algebraic structures prospective,non-commutative cryptography has been considered to resist quantum.The matrix and tensor operator we adopted also satisfied with this non-commutative algebraic structures,so they can be used as candidate problems for resisting quantum from perspective of computational complexity theory and algebraic structures.Secondly,a new problem was constructed based on the introduced problems in this paper,then a key exchange protocol and a public key encryption scheme were proposed based on it.Finally the security analysis,efficiency,recommended parameters,performance evaluation and etc.were also been given.The two schemes has the following characteristics,provable security,security bits can be scalable,to achieve high efficiency,quantum resistance,and etc.     

具有指定接收组门限共享验证签名加密方案

本文提出了一个具有指定接收者验证的签名加密方案.该方案是数字签名与公钥密码体制的有机集成.与普通数字签名方案相比,除了具有认证性、数据完整性外还具有保密性和接收方的隐私性.然后又利用门限方案构造了一个(t,n)门限共享验证签名加密方案.与现有的门限共享验证签名加密方案相比具有数据传输安全、通信代价更小、执行效率更高、能够确切地检查出哪个验证者篡改子密钥等特点.     

基于国产密码算法的数控网络的认证与验证模型研究及安全评估

该文针对工业控制系统安全,提出面向数控系统(NCS)网络安全保护技术框架,选用国产密码系列算法中的SM2, SM3, SM4算法,设计并建立了数控网络(CNC)认证与验证模型(AUTH-VRF),分内外两层为数控网络提供安全防护。外层为数控网络设备间通信与传输进行安全认证实现网段隔离,内层验证通信协议完整性以确保现场设备接收运行程序的正确性与有效性;通过基于SM2, SM3, SM4算法设计和部署的外层防护装置,为分布式数控(DNC)设备与数控系统之间的通信提供身份认证与文件加密传输;同时针对工业控制网络的S7Comm工业通信协议数据,通过SM3算法验证专有工业协议数据完整性。通过网络攻击实验证明,AUTH-VRF模型可以为数控网络中工业生产数据提供有效的安全认证和资源完整性保护,为满足我国关键基础设施“国内、国外工业控制系统产品共同安全可控”和“安全技术深入工业控制系统各个层级”的需求提供了实际可行的技术参考方案。     

Location privacy preserving scheme against attack from friends in SNS

In order to enrich the performance of the user's location information and to meet the diverse needs of users,a location privacy protection scheme based on attribute encryption was designed,which provided precise,more accurate,fuzzy and private four modes to manage the location information.The scheme was based on the algorithm of WT-CP-ABE.The location information was divided into three parts according to a close friend of grade,then the key infor-mation and position information was encrypted with attribute-based encryption and symmetric encryption method respec-tively and the ciphertext was published to the social network.The security of the scheme is analyzed,which shows that the scheme has the advantage of user attribute information confidentiality,data confidentiality and can resist the collusion attack.     

计算机支持的协同工作中的安全机制

分析和比较了3种可在协同工作中采用的安全机制，包括基于单钥体制、基于公钥体制，以及基于混合方式的安全机制。单钥体制更适合于保密通信，公钥体制更适合于分配单钥体制的密钥，而混合方式则兼有单钥体制及公钥体制的优点，因而更符合协同工作系统对于安全机制的要求。     

云存储中密文数据的客户端安全去重方案

云存储环境下,客户端数据去重能在本地进行文件重复性检测,有效地节约存储空间和网络带宽.然而,客户端去重仍面临着很多安全挑战.首先,由于将文件哈希值作为重复性检测的证据,攻击者很可能通过一个文件的哈希值获得整个文件;其次,为了保护数据隐私,收敛加密被广泛运用于数据去重方案,但是由于数据本身是可预测的,所以收敛加密仍不可避免地遭受暴力字典攻击.为了解决上述问题,本文首次利用盲签名构造了一个安全的密钥生成协议,通过引入一个密钥服务器,实现了对收敛密钥的二次加密,有效地预防了暴力字典攻击;并进一步提出了一个基于块密钥签名的拥有权证明方法,能够有效预防攻击者通过单一的哈希值来获取文件,并能同时实现对密文文件的文件级和块级去重.同时,安全分析表明本文方案在随机预言模型下是可证明安全的,并能够满足收敛密钥安全、标签一致性和抗暴力字典攻击等更多安全属性.此外,与现有方案相比,实验结果表明本文方案在文件上传和文件去重方面的计算开销相对较小.