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可扩展的网络弱点扫描系统设计与实现

计算机工程 2002年第2期28卷 149-151页

作者：黄菁苏璞睿蒋建春卿斯汉中科院信息安全技术工程研究中心北京100080

提出一种可扩展的网络弱点扫描系统能够在较短的时间内对新发现的安全问题迅速做出反应,极大地提高了系统的安全防御能力。,

关键词： Internet 网络弱点扫描系统设计网络安全入侵检测

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NIDS报警信息关联分析进展研究

计算机科学 2004年第12期31卷 61-64页

作者：刘雪飞马恒太张秉权吴伯桥蒋建春文伟平南京理工大学计算机系南京210096 中科院信息安全技术工程研究中心湖南信息技术职业学院计算机系长沙610200

入侵检测技术是当前网络安全领域的一个研究热点,报警关联分析是其中一个重要部分。通过报警信息的关联分析,可以显著地降低入侵检测系统的误警率,提高它的检测率和可用性,帮助网络管理员更好地掌握当前网络的安全状况。本文对当前国际... 详细信息

入侵检测技术是当前网络安全领域的一个研究热点,报警关联分析是其中一个重要部分。通过报警信息的关联分析,可以显著地降低入侵检测系统的误警率,提高它的检测率和可用性,帮助网络管理员更好地掌握当前网络的安全状况。本文对当前国际上报警关联分析技术的研究现状进行了综合分析,并对现有方法进行了分类和比较。

关键词： NIDS 入侵检测技术入侵检测系统网络安全关联分析误警率网络管理员报警信息国际综合分析

THE CHANGES OF LAND USE AND THE TEMPORAL & SPATIAL CHARACTERISTICS OF SALT-AFFECTED LANDS ON THE REGIONAL SCALE

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THE CHANGES OF LAND USE AND THE TEMPORAL & SPATIAL CHARACTER...

第四届智能化农业信息技术国际学术会议

作者： Yujian Yang~(1,2. Jingsong Yang~2.Xueqin Tong~1 Jianhua Zhu~1 1 S&T information engineering {2. {3. of Shandong academy of Agricultural Science,Jinan 2.0100,china 2.6} Institute of Soil Science,chinese academy of Sciences,Nanjing 2.0008,china

Yucheng city in Shandong Province was taken as the typical Fluvo-Aquic soil area in this paper. With the utilization of three different stages remote sensing images and groundwater depth spatial map, soil type spatial map,groundwater salinity spatial map of covering the study area,the support of multi- temporal analysis method,the dynamic change of land use is studied in typical Fluvo-Aquic soil area, the temporal and spatial evolution of salt-affected lands is *** study results show that the areas of land use types of 3.different temporal stages are different in the study area,the area of salt- affected lands is 5 3.0 hm in 1987,3.670 hm in 1994 and 2.000 hm in *** the spatial distribution,spatial location of most of salt-affected lands in 1994 follows the distribution of salt-affected lands in 1987,but the few of new saline soil spots come into being *** the area of salt-affected lands decreased from 1987 to *** the distribution of salt-affected lands in 2.02.with in 1994,the results are similar to the regime from 1987 to 1994,which explains the difficulties of improvement of salt-affected lands.

关键词： Regional scale Land use change Spatial and temporal change Salt-affected lands

Construction of Convolutional Network Coding for Cyclic Multicast Networks

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Construction of Convolutional Network Coding for Cyclic Mult...

2.10 IEEE 2.d Symposium on Web Society

作者： Qin Guo~(1,2.3.,Mingxing Luo~(1,2.3.,Lixiang Li~(1,2.3.,Licheng Wang~(1,2.3.,Yixian Yang~(1,2.3. 1 information security {2.,State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications,Beijing 100876,{3. 2.Key Laboratory of Network and information Attack and Defence Technology of MOE, Beijing University of Posts and Telecommunications,Beijing 100876,{3. 3.National {12. Laboratory for Disaster Backup and Recovery, Beijing University of Posts and Telecommunications,Beijing 100876,{3..

＜正＞In this paper,we present a practical algorithm to construct the convolutional multicast network coding over any finite directed cyclic *** dual line graph of a directed cyclic graph is considered as a *** regarding the global encoding kernels in the original graph as the corresponding inputs or outputs of some subsystem and the local encoding kernels in original graph as gains of channels,we can construct the convolutional network code through randomly choosing the local encoding kernels of the directed cycles in *** using Mason formula,the construction becomes very efficient.

关键词： Convolutional network code convolutional multicast dual line graph Mason formula

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部分Bent函数的密码学性质

通信学报 2002年第5期23卷 113-118页

作者：赵亚群冯登国李世取中国科学院研究生院信息安全国家重点实验室北京100080 郑州信息工程大学信息工程学院信息研究系河南郑州450002

本文讨论了部分Bent函数的若干密码学性质,分别给出了部分Bent函数满足平衡性、相关免疫性和扩散准则的充分必要条件,具体求出了部分Bent函数的非线性度以及部分Bent函数与仿射函数的符合率。

关键词： Bent函数密码学性质保密通信

ANALYSIS OF CONSTRUCTION OF RURAL information SERVICE SYSTEM IN THE WORLD

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ANALYSIS OF CONSTRUCTION OF RURAL INFORMATION SERVICE SYSTEM...

The 3.d International Symposium on Intelligent information Technology in Agriculture(ISIITA)

作者： Yunlong Zhao~(1,2. Xiangyang Qin~(1,3. Ailing Wang~4 ~1National engineering {2. {2. for {3. technology in agriculture,Beijing,100089,china ~2.nstitute of Agricultural Environment and Sustainable Development,chinese academy of Agriculture Sciences,Beijing,100081,china ~3.cijing Forestry University,Beijing,100083.china ~4Institute of Integrated Development of Agriculture Beijing academy of Agricultural and Forestry Sciences,Beijing,100089,china

＜正＞Based on the analysis of construction of rural information service system in china and other countries, the international experiences of construction of rural information service system were summarized,and the domestic problems of construction of rural information service system were discussed so that it can be used for reference to agricultural information construction in the future,and be helpful to solution of the problem of the last mile of rural information service.

关键词： rural information service system status quo experience problem

DYNAMIC ONLINE TRAFFIC IDENTIFICATION SCHEME BASED ON DATA STREAM CLUSTERING ALGORITHM

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DYNAMIC ONLINE TRAFFIC IDENTIFICATION SCHEME BASED ON DATA S...

2.11 4th IEEE International Conference on Broadband Network and Multimedia Technology

作者： Dan Li 1 2.3.Xiaobo Xu 1 2.Yang Xin 1 2.Zhengming Hu 1 1 information {2. {2. Beijing University of Posts and Telecommunications Beijing 100876 {3. 2.National engineering Laboratory for Disaster Backup and Recovery Beijing 100876 {3. 3.Beijing Safe-Code Technology Co.Ltd. Beijing 100876 {3.

Although researches on network traffic identification have already got some achievements, but most of them are not suitable for online traffic classification by considered the dynamic feature of *** this paper,we propose a dynamic online traffic identification method by introducing density-based clustering algorithm for stream data called DStream,and using the feature select algorithm to reduce dimension of feature *** result of classification is compared with CluStream *** classifer shows better performance than CluStream,and outliers can be detected.

关键词： data stream clustering traffic identification machine learning

ON THE SECOND GREEDY WEIGHT FOR LINEAR CODES SATISFYING THE FULLRANK CONDITION

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Journal of Systems Science & Complexity 2005年第1期18卷 55-66页

作者： CHENWende KLOVETorleiv LaboratoryofSystemsandControlandcenterofinformation{2. AcademyofMathematicsandSystemsScienceChineseAcademyofSciencesBeijing100080China DepartmentofInforrnatics UniversityofBergenBergenHighTechnologyCenterN-5020BergenNorway

The maximum of g2.d2.for linear [n, k, d; q] codes C is studied. Here d2.is the smallest size of the support of 2.dimensional subcodes of C and g2.is the smallest size of the support of 2.dimensional subcodes of C which contains a codeword of weight d. The extra cost to the greedy adversary to get two symbols of information using some algorithm is g2.d2. For codes satisfying the fullrank condition of general dimensions, upper bounds on the maximum of g2.d2.are given. Under some condition we have got code C where g2.d2.reaches the upper bound.

关键词： greedy weight linear code bounds

在IP包过滤中状态TCP包的过滤研究与设计

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计算机工程与应用 2002年第7期38卷 162-164,176页

作者：原箐卿斯汉中国科学院信息安全技术工程研究中心北京100080

IP包过滤防火墙是构造整体网络安全系统的必不可少的部分。传统的IP包过滤防火墙有许多的缺陷,解决方法之一是使防火墙具有状态过滤能力。以TCP为例,状态过滤机制不仅能根据ACK标志和源、目的地址及端口号进行过滤,还能根据TCP包里的序... 详细信息

IP包过滤防火墙是构造整体网络安全系统的必不可少的部分。传统的IP包过滤防火墙有许多的缺陷,解决方法之一是使防火墙具有状态过滤能力。以TCP为例,状态过滤机制不仅能根据ACK标志和源、目的地址及端口号进行过滤,还能根据TCP包里的序列号和窗口大小来决定对该包的操作。这样可以防止一些利用TCP滑动窗口机制的攻击。在IP包过滤里加入状态过滤机制不仅能阻止更多的恶意包通过,还能提高IP包过滤的过滤速率(这对防火墙来说是很重要的)。

关键词： IP包过滤状态过滤序列号滑动窗口 TCP包防火墙网络安全计算机网络