基于身份密码学的EAP-AKA方案

针对3GPP R8版本中的EPS-WLAN互联网络,分析EPS-WLAN互联网络接入认证协议EAP-AKA的安全性,指出其存在的安全隐患以及对于特定攻击存在的脆弱性。在EAP协议的基础上,引入基于身份的加密和密钥协商的要素,提出基于身份密码学的改进方案。通过性能和安全性分析,证明该协议能够在不增加协议步骤和系统负担的条件下,克服EAP-AKA协议的安全隐患,提高协议的安全性。     

基于部署信息的无线传感器网络密钥管理方案

在充分考虑无线传感器网络自身特点的基础上,针对现有无线传感器网络密钥管理中存在的问题,利用基于身份的加密算法,提出一个基于部署信息的无线传感器网络密钥管理方案（KMSBDK）。从该方案的安全性、连通性、可扩展性、有效性等方面进行分析,并与现有一些典型方案进行比较。结果表明,KMSBDK有较好的性能。     

基于 IBC的无线传感器网络层簇式密钥管理方案*

密钥管理是无线传感器网络中关键安全技术之一。无线传感器网络的密钥管理由于布置位置、计算量有限、存储能力有限,使得设计面临许多挑战。在分析无线传感器网络安全需求的基础上,针对无线传感器网络密钥管理问题,运用层簇式网络结构,通过身份加密方式,进行节点合法性认证,完成基站与簇头,簇头与节点之间的密钥,保证无线传感器网络安全通信。通过安全性分析和效能分析,该密钥管理方案较好的满足无线传感器网络的安全需求,降低通信开销,有效地解决密钥管理的问题。     

V2V车联网中隐私保护性异构聚合签密方案

随着5G/6G移动通信技术的发展,车联网对于车辆对基础设施、车辆对车辆之间快速交换信息的要求明显提高。然而,在5G/6G网络切片技术中,不同的网络切片采用不同的密码体制,从而会形成异构网络通信。异构车联网可以实现车辆信息的即时共享,但开放的无线通信通道使车辆隐私信息易被泄露,这需要保证共享数据的机密性和完整性。提出一种隐私保护性异构聚合签密方案。该方案使用异构签密技术,在公钥基础设施和基于身份的密码系统（IBC）网络切片环境中可实现不同密码系统注册车辆之间的异构安全通信,同时采用聚合技术,在IBC环境中的车辆将接收到的密文消息进行聚合并对其解密。为确保解密后的密文消息完整,接收车辆对消息进行批量验证,以减少解签密过程所需的时间及传输量。在随机预言模型下,该方案对适应性选择密文攻击具有不可区分性,对适应性选择消息攻击具有存在性与不可伪造性。实验结果表明,相比基于边缘计算的无证书聚合签密方案与车联网高效签密方案,该方案在发送车辆对消息进行签密的阶段中所用时间减少了18.91%~63.12%,在接收车辆对密文进行解签密的阶段中所用时间减少了5.91%~33.66%,具有较高的计算效率。     

过密等离子体包覆目标的散射特性分析

从波动方程出发,结合等离子体特性,分析了过密等离子体中电磁波的传播特性。在此基础上,运用阻抗边界条件给出了含过密等离子体层的Fresnel反射系数的计算公式,并与物理光学（PO）理论相结合,利用OPENGL机制,实现了过密等离子体包覆目标时雷达散射截面的可视化计算方法。该方法充分利用光照模型和z-buffer消隐技术,从而使计算过程可视、快速。最后,以导体平板和导体球为例计算了过密等离子体包覆目标的RCS,结果表明过密等离子体包覆下的目标仍具有RCS缩减。     

基于异构密码系统的混合签密方案

针对异构密码系统的签密算法大多采用的是公钥加密技术，不具有可加密任意长消息的特点，不符合现实的应用环境，而混合签密技术则可解决这一不足。提出了一个基于异构密码系统的混合签密方案。该方案是由基于身份的密码（Identity Based Cryptography，IBC）体制到无证书密码（Certificateless Cryptography，CLC）体制的异构签密方案。不但能使私钥生成器（Private Key Generator，PKG）和密钥生成中心（Key Generating Center，KGC）分别在IBC密码体制和CLC密码体制中产生自己的系统主密钥，同时，在随机预言模型下，方案在计算性Diffie-Hellman和双线性Diffie-Hellman困难问题下具有不可伪造性和不可区分性。     

发射极掺杂工艺对产业化IBC太阳电池性能的影响

主要对n型IBC太阳电池结构的发射极硼掺杂工艺进行优化设计,并通过ENDA2模拟软件对实验结果进行验证分析,通过复合损失分析,研究不同发射极硼扩工艺对产业化IBC太阳电池电性能的影响.实验结果表明,采用较高推进温度的硼扩散工艺,获得发射极方阻98Ω/sq,该发射极具有最低的表面浓度1.68×1019 cm-3和最深结深...     

Developments in plastics packaging for the transport of dangerous goods

Several interesting developments in plastics packagings and intermediate bulk containers (IBCs) for the transport of dangerous goods are of importance. Significant developments include the application of new materials and packaging concepts, the increasing re‐use of packaging and the possibility of the application of recycled material. How these developments have influenced or should influence the UN recommendations and regulations on the transport of dangerous goods is discussed. Further, the role of CEN and ISO standards, which are under development, is indicated. In this context, the European project CHEMPACK funded by the EC within the framework of the Standards, Measurements and Testing programme, is outlined. This project is executed in cooperation with raw materials manufacturers, packaging/IBC manufacturers and research institutes, and is coordinated by TNO. The aim of the project is to develop harmonized test methods and procedures for the assessment of the chemical compatibility of plastics packagings and IBCs. Copyright © 1999 John Wiley & Sons, Ltd.     

Modeling High Frequency Propagation in Tunnel Environments by Iterative Physical Optics Method

A new formulation of the Iterative PhysicalOptics (IPO) method, including waveguide wall loss effects, hasbeen developed to model high frequency electromagnetic wavepropagation in tunnel environments. The lossy behavior of thetunnel walls has been considered throughout the inclusion of theImpedance Boundary Condition (IBC) model in the formulation of theIPO. Different arched tunnels have been studied, showing that thisapproach has a convergent behavior and providing accurate resultsfor realistic tunnel models. Moreover, the computational costassociated with the analysis of long tunnels has been significantlyreduced by using a connection scheme which splits the tunnel into aset of short sections that can be more easily analyzed. Someresults are shown, illustrating the capability of the proposedmethod.     

A Modeling Method of the IBC System Based on the Composite Fading Channel

Intra-body communication (IBC) is a novel short-range non-RF(radio frequency) wireless communication technique specified by the IEEE 802.15.6 using the human body as a transmission medium. In this work, a new modeling method of the IBC system based on the composite fading channel is proposed, where the cascaded filter is used to express the composite fading channel and the modulation method in transmitter and receiver. The composite fading channel combines with the average attenuation, group delay, multipath effect, and shadowing effect. The modulation is adopted orthogonal frequency division multiplexing (OFDM), and thereby the constellation, cyclic prefix, bit error rate, and pilot mode are determined. As a result, the whole process and multi-parameter simulation of IBC system can be achieved. It provides a theoretical foundation for the system design of the intra-body communication and will promote its application to the wireless body area network (WBAN).