共享文件加密存储分级访问控制方案的实现

为解决传统文件共享方式单一、安全性不足以及共享文件权限控制自主性过高的问题,提出了一种文件加密存储分级访问控制方案,通过在系统中增加分级管理单元,实现对用户、文件的分级以及用户对文件访问权限的控制,实现文件的访问范围可控;通过文件的加密实现文件存储和传输的安全性;分级密钥的使用,简化了密钥的存储。服务器端文件的加解密操作通过专门的密码卡实现,减轻了服务器端的工作量,加速了文件的加解密处理。在基于PC和Zynq平台上进行了验证,实现了预定功能。     

基于扩展存储过程的数据库加密技术研究

提出了一种基于扩展存储过程的数据库加密系统方案,并阐述了主要的功能模块.该方案应用扩展存储过程和UDF(用户自定义函数)对动态链接库进行封装,实现了加密功能,并对两级密钥采用智能卡进行存储,从而在不影响系统原有功能的基础上,提高了数据库系统的安全性.     

基于智能卡的数字电影版权管理系统

提出了基于智能卡的数字电影版权管理方案。该方案将密钥数据存储于智能卡中并且解密运算全在卡内完成,与通用的软件方案相比提高了系统的安全性,用户认证时使用的是卡内信息而非用户信息或设备信息,不仅保护了用户隐私,还实现了权力转移的功能。开发了基于智能卡的数字电影DRM系统,实现了数字电影加密分发、授权和权利转移等系统功能,满足了数字电影版权保护的安全需求。     

基于智能卡的数字电影版权管埋糸统

提出了基于智能卡的数字电影版权管理方案.该方案将密钥数据存储于智能卡中并且解密运算全在卡内完成,与通用的软件方案相比提高了系统的安全性,用户认证时使用的是卡内信息而非用户信息或设备信息,不仅保护了用户隐私,还实现了权力转移的功能.开发了基于智能卡的数字电影DRM系统,实现了数字电影加密分发、授权和权利转移等系统功能,满足了数字电影版权保护的安全需求.     

加密电子病历数据共享方案

为了实现电子病历数据的细粒度访问控制以及安全存储与共享,提出了一种基于属性的云链协同存储的电子病历共享方案。该方案用对称加密算法加密电子病历,用基于密文策略的属性基加密算法加密对称密钥,用可搜索加密算法加密关键字。电子病历密文存储在医疗云上,安全索引存储在联盟链上。该方案使用可搜索加密技术实现关键字的安全搜索,使用代理重加密技术实现用户属性的撤销。经安全性证明,该方案能够实现密文的安全性和关键字的安全性。数值模拟实验结果表明,该方案是有效的。     

基于TDI的网络虚拟磁盘驱动研究与实现

应个人网络存储应用的需要,研究和开发网络虚拟存储系统。实现这种系统的关键是开发网络虚拟磁盘驱动。通过介绍在Windows NT内核模式下设计虚拟磁盘驱动的详细原理,分析和研究网络虚拟磁盘驱动的设计与实现。开发过程中,调用TDI(Transport Driver Interface)函数,实现了网络虚拟磁盘驱动的网络功能。使用此方法开发虚拟存储系统,由于是基于Windows内核的开发,所以网络传输效率较高;另外,基于此技术的虚拟存储系统,没有改变用户的使用习惯,所以大大方便了用户的使用。     

虚拟磁盘服务软件框架设计

虚拟磁盘技术是数据存储虚拟化技术的一个重要组成部分。当前,开发新型虚拟磁盘驱动需要涉及到较多的操作系统内核编程,这对开发人员提出了较高的要求。研究了一种通用的虚拟磁盘服务软件的实现框架,此框架可对操作系统内核提供标准块设备接口,对用户态服务进程提供一组标准服务接口用于实现服务的注册和请求/应答的传递,从而实现了操作系统内核模块的通用性。最后,基于Linux的NBD驱动实现的原型系统验证了工作的实用性。     

一种移动个人信息管理系统的存储解决方案

移动个人信息管理系统是运行在掌上电脑、智能手机等移动设备上的个人信息管理系统。为实现其对各种类型的个人信息的强大管理功能,必须要有一个适宜的底层存储方案作为保障。本文基于COM的结构化存储机制和实验室自主研发的嵌入式移动数据库管理系统SwiftDB的数据管理功能,提出了一种信息项存储方案,能够解决个人信息项种类繁多和移动设备上资源有限等系统存储难点,以较小的代价和较快的存取速度实现用户对信息项的访问操作。     

基于TDI的网络虚拟磁盘驱动研究与实现

应个人网络存储应用的需要，研究和开发网络虚拟存储系统。实现这种系统的关键是开发网络虚拟磁盘驱动。通过介绍在Windows NT内核模式下设计虚拟磁盘驱动的详细原理，分析和研究网络虚拟磁盘驱动的设计与实现。开发过程中，调用TDI（Transport Driver Interface）函数，实现了网络虚拟磁盘驱动的网络功能。使用此方法开发虚拟存储系统，由于是基于Windows内核的开发，所以网络传输效率较高；另外，基于此技术的虚拟存储系统，没有改变用户的使用习惯，所以大大方便了用户的使用。     

基于可信计算平台的身份管理框架*

针对网络用户身份管理难题及现有的身份管理方案存在的不足,基于可信计算平台完整性校验、保护存储和访问控制以及远程平台校验等安全特性,提出了可信计算平台身份管理方案和协议。本方案实现了多种方式的身份认证及身份、身份认证审计记录和主密钥、审计密钥、平台AIK私钥的加密存储,以及移动平台的可信验证、加密身份的还原和服务提供者身份标志的查找定位,并实现了身份信息和认证数据的加密传输。最后,进行了安全性分析,结果表明该方案在保护用户身份信息安全的前提下,大大减轻了用户身份管理的负担。     

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)

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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