RS检测算法的分析与改进

针对Jessica Fridrich提出的基于无损嵌入容量的LSB信息隐藏检测方法(RS算法),通过实验讨论了对静态图像隐写分析的准确率有影响的几个主要因素,并分析这些因素产生重要影响的根本原因。提出了对RS算法的改进方案,从而减小隐写检测的偏差程度,提高检测的准确度。     

一种改进的LSB数字图像隐藏算法*

目前针对常用的LSB信息隐藏,SPA分析(sample pair analysis)和RS方法(regularand singular groups method)能以很高的精度估计出图像中隐藏信息的比率。基于几何变换的性质,提出了一种可用于图像置乱技术的亚仿射变换,并利用矩阵编码思想改进LSB的嵌入方式,从而使嵌入数据获得了较好的抗隐写分析性能。实验结果表明,该算法能有效抵抗RS和SPA隐写分析,并保持图像的直方图统计特征,且适用于灰度图像和彩色图像,易于实现。     

EzStego的嵌入、提取与检测的C++实现

信息隐藏与隐写分析日益受到人们的关注，而将GIF图片作为载体的EzStego是一款广爱喜爱的工具。无论从研究角度，还是从使用角度，实现了它的C＋＋版本都是很有意义的。除了彻底了解EzStego的算法，还可以作为开发和测试其它基于GIF调色板图像的隐写及隐写分析的算法的基础工具。事实上，借助于C＋＋版的EzStego，首次把基于无损嵌入的RS隐写分析方法用于检测隐藏信息的存在性。实验结果证明了该方法可行性。     

基于数字图像LSB嵌入的检测算法

信息隐藏技术和信息隐藏分析技术是信息安全领域的重要研究方向。信息隐藏技术包括隐写术和数字水印。信息隐藏分析技术包括了检测、攻击和破解3个步骤。位图的最不重要位嵌入方法是当今流行的基于图像的信息隐藏方法。提出了在嵌入信息服从均匀分布的情况下，两个基于图像时空域最低有效位连续嵌入的统计检测算法：μ检验算法和x^2检验算法。对部分算法进行了漏报率和误报率分析。通过实验验证了两个算法的检测效果，给出了相关的实验分析和结论。     

信息隐写技术的研究与应用

本文介绍了信息隐藏技术中隐写术的工作原理和典型算法。阐述了信息隐藏技术与传统加密技术区别以及隐写技术与数字水印的区别。对信息隐藏算法的特征和评价指标进行了分析。本文描述了图像分块隐写技术算法,并对该算法进行了比较和评价。     

基于图像的信息隐藏检测算法和实现技术研究综述

基于图像的信息隐藏及分析技术是信息安全领域的一个重要方面。信息隐藏技术包括了隐写术和数字水印。信息隐藏检测技术是信息隐藏技术的攻击技术。通过基于图像的信息隐藏检测技术，可以判断图像中是否存在信息的隐藏和嵌入。基于图像的信息隐藏检测技术包括了数字图像特征分析、检测算法和实现技术。提出了基于图像的信息隐藏检测技术的知识体系。重点阐述了多种基于图像的信息隐藏检测算法，并进行了理论分析和实验测试。分析了现有的几种基于图像的信息隐藏的实现技术，提出了一个面向Internet应用的检测系统模型。     

一种基于多变换的LSB隐写算法

本文对传统的LSB隐写算法进行了研究，提出了一种新的LSB隐写方法，该方法利用多种变换实现信息隐藏。实验及理论分析结果表明，该方法可以抵御RS分析及统计分析的攻击，提高传统LSB隐写算法的安全性。     

空间域LSB的信息隐藏检测技术研究

基于图象的信息隐藏检测技术是隐写分析技术的基础,对于保障网络信息安全和提高信息隐藏算法的安全性具有重要意义。本文针对基于空间域图象的LSB信息伪装的方法,介绍了隐写分析的原理,以及现有的信息隐藏检测算法,并对这些算法进行了评价。最后指出了信息隐藏检测技术未来发展的方向,以及发展前景。     

基于DCT系数多方向相关性的信息隐藏盲检测方法

给出了一种JPEG域基于离散余弦变换(DCT)系数多方向相关性的图像信息隐藏盲检测方法。首先利用DCT系数多方向相关性构造差值彼邻相关矩阵,然后利用此矩阵提取48维特征向量,最后使用支持向量机(SVM)区分载体、载密图像。该方法应用于6种典型的JPEG图像隐写算法,实验结果表明,该方法对这些隐写算法都能够进行比较可靠的检测。     

基于图像的隐写算法性能评价体系研究

为解决图像隐写技术评价方法研究滞后于信息隐藏技术发展的问题,提出基于图像的隐写算法性能评价体系,包括指标体系,测评体系和综合测评体系。在分析隐写算法特性的基础上,提出隐写算法指标体系;从测评框架,测评策略,测评方法和测评工程建立测评体系;采用二级模糊综合评估模型对图像隐写算法的性能进行综合评价。实验结果表明,利用该评价体系可以对现有的隐写算法进行有效评价。     

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