标准模型下基于身份的认证密钥协商协议

由于在现实世界中无法实现随机预言模型,标准模型下可证安全的高效密码协议成为近年来的研究热点.现有的标准模型下可证安全的基于身份的认证密钥协商协议,要么以未经安全性证明的基于身份的加密方案为基础设计密钥协商协议,无法保证所提出密钥协商协议的安全性;要么在弱的安全模型中设计密钥协商协议,导致协议的安全性差.采用MTI协议族的思想,基于判定性q-ABDHE假设和判定性BDH假设,设计了一个新的基于身份的认证密钥协商协议IBAKA,并第1次在标准模型下证明该协议是eCK安全的.与现有的标准模型下基于身份的密钥协商协议相比,IBAKA协议的计算效率、通信效率等方面性能优越.     

标准模型下可证安全的身份基认证密钥协商协议

提出一个在标准模型下可证安全的双方身份基密钥协商协议.新协议的设计思想来源于Gentry的身份基加密方案.提出的新协议可工作于托管或者无托管两种模式.在标准模型下(即不利用随机预言假设),文中给出了该协议的安全性证明.新提出的协议与目前现有仅在随机预言模型中证明安全的协议相比,在计算和通信效率方面相当.     

标准模型下可证安全的属性基认证密钥交换协议

在Waters的属性基加密方案的基础上,提出了一个在标准模型下可证安全的两方属性基认证密钥交换协议。在修改的BJM模型中,给出了所提协议在判定性双线性Diffie-Hellman假设下的安全性证明。此外,针对无会话密钥托管的应用需求,在基本协议的基础上,构造了能够有效防止会话密钥托管的属性基认证密钥交换协议。在计算效率方面,所提协议与现有的仅在随机预言模型下可证安全的属性基认证密钥交换协议相当。     

一种改进的基于移动通信的论证密钥协商协议——MAKAP~＋

针对移动通信中的可证安全的双向密钥认证协议MAKAP协议的缺陷--不能抵御未知密钥共享攻击,给出了一个改进后的MAKAP+协议,在随机预言机模型中证明了本协议的安全性.改进后的协议不使用任何加密解密算法,具有更高的可靠性.通过性能分析,证明了此协议的实用性.     

基于椭圆曲线的加密密钥交换协议

加密密钥交换协议(EKE)的目的是利用安全性低的口令协商安全性高的密钥,进而利用密钥对以后的通信进行加密或身份认证,从而实现安全通信.基于验证元的EKE是针对服务器泄露攻击问题提出的.本文基于椭圆曲线密码系统的特点,给出了一个基于验证元的3EKE,该协议中,服务器通过口令实现对用户的认证;协议能够抵抗服务器泄露等攻击,...     

不使用对的基于身份的广播加密

基于身份的加密方案和基于身份的广播加密方案一般都是使用椭圆曲线上的双线性映射(也称为对)来实现的。提出一个不使用双线性映射的基于身份的广播加密方案,基于二次剩余假设,在Random Oracle模型下是可证安全的。     

一种强安全的无证书非交互密钥交换协议

非交互密钥交换协议(Non-interactive Key Exchange,NIKE)允许通信双方在没有信息交互的情况下生成一个共享密钥。在基于身份的非交互密钥交换协议(Identity-based Non-interactive Key Exchange,ID-NIKE)中,用户私钥是由私钥生成中心(Private Key Generator,PKG)分发给用户的,因此PKG可以计算出用户之间的共享密钥,即存在密钥托管的问题。针对ID-NIKE的上述不足,基于无证书的公钥密码体制(Certificateless Public Key Cryptography,CL-PKC),首先提出了无证书非交互密钥交换协议的安全模型,然后设计了一个强安全的无证书非交互密钥交换协议方案,并在随机预言模型下基于BDH假设给出了协议的安全性证明。该方案是第一个基于CL-PKC的非交互密钥交换协议方案,并结合了CL-PKC和NIKE的优点,因此该方案不仅具有非交互的性质,而且PKG计算不出用户间的共享密钥,所以其可以更好地保护用户隐私。另外,该协议还允许用户部分秘密信息泄露,因此具有更高的安全性。     

基于身份可证安全的双方密钥协商协议*

针对双方认证和密钥协商协议中会话双方属于不同密钥产生中心的情况,利用双线性对性质和BDH假设,基于可证安全的eCK模型提出一种基于身份可证安全的双方密钥协商协议。该协议从测试会话在随机谕示模型中是否存在相应的匹配会话两个方面,对提出的协议方案进行了安全性证明：若BDH假设不可解,则本方案是安全的认证密钥协商协议。     

叛逆者可追踪的非对称群组密钥协商协议

非对称群组密钥协商(Asymmetric Group Key Agreement, ASGKA)的概念在2009年欧密会上被首次提出,其协议结束时协商出来的只是一个共享的加密密钥。这个加密密钥可以被敌手访问,而且对应多个不同的解密密钥,每个群组用户都可以计算出一个对应该公钥的解密密钥。同时指出进一步研究的问题之一是如何实现叛逆者可追踪的ASGKA协议。设计了一个标准模型下可证安全的非对称密钥协商协议ASGKAwIT,该协议可以实现叛逆者追踪。     

一种实用的无证书两方认证协议

Lippold等提出可证安全的无证书两方认证协议,但协议要求较大的计算量.基于Cash,Kiltz和Shoup提出的双diffie-hellman问题,提出新的无证书认证密钥协商协议.与Lippold的协议相比,新协议具有相同的消息带宽,并且降低了计算复杂度.最后,基于CDH假设和BDH假设,在随机预言模型下证明了协议的安全性.     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

正~~     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate