检索结果-内蒙古大学图书馆

Primary User Emulation Attacks Analysis for Cognitive radio Networks Communication

Telkomnika - Indonesian Journal of Electrical engineering 2013年第7期11卷 3905-3914页

作者： Wang, Shan-Shan Luo, Xing-Guo Li, Bai-Nan National Digital Switching System Engineering Technological R and D Center Jinshui Zhengzhou 450001 China

Cognitive radio Network is an effective technology and a hot research direction which can solve the problem of deficient resource and revolutionize utilization. And its safety technology attracts more and more researches. Primary user emulation attacks (PUEAs) are typically easy and largely affecting. PUEAs come from both malicious misbehavior secondary users (MMUs) and selfish misbehavior secondary users (SMUs). The former is studied much more deeply than the later one. distinguishing MMU and SMU, we propose a Four dimensional Continuous Time Markov Chain model to analyze the communication performance of normal secondary users under PUEAs, and typically affected by SMUs. Furthermore, we compare several PUEA detection schemes. The emulation results indicate that the SMU detection mechanism is essential for the PUEA detection schemes, which can improve the detection effects largely. © 2013 Universitas Ahmad dahlan.

关键词： Cognitive radio

来源：评论

学校读者我要写书评

暂无评论

Analysis and Prevention for Cross-site Scripting Attack Based on Encoding

Analysis and Prevention for Cross-site Scripting Attack Base...

引用

2013 IEEE 4th International Conference on Electronics Information and Emergency Communication

作者： ding Lan Wu ShuTing Ye Xing Zhang Wei Library of Zhengzhou Teachers College Department of Intelligence and Reconnaissance Zhengzhou Teachers CollegeSpecial Police Academy China National Digital Switching System Engineering &Technological R&D Center Information Engineering University

ISBN: (纸本)9781467349345

With the development of Web application, cross-site scripting attacks have been rapidly increasing, and the technique of those attacks is constantly updating. There has been some special advanced attacks such as the one based on encoding. In this paper we analyze two kinds of those attacks respectively based on the binary and N-ray alphabets encoding, then presents a dynamically access control method to prevent them by means of the existing detection and prevention technology of cross-site scripting attack, making up the existing approach being lack of the practicality, and the experimental results verify the feasibility and practicality of our protection mechanism.

关键词： Cross Site Scripting Attack Web Application Cross- domain Access Encoding Based on N-ary Alphabets

来源：评论

学校读者我要写书评

暂无评论

Enhancing wireless security with theory of ill-posed problem: A novel physical-layer encryption mechanism

Enhancing wireless security with theory of ill-posed problem...

引用

International Conference on Information Science and Technology (ICIST)

作者： Xiangyang Xu Wenyu Luo Huawei Song Lizhi Zhang National Digital Switching System Engineering & Technological R&D Center Zhengzhou Henan PRC

ISBN: (纸本)9781467327626

This paper studies physical-layer security without knowing the eavesdropper's channel state information. The use of ill-posed theory to protect wireless transmissions is proposed. Firstly, the problem of randomized transmission is translated to that of solving ill-posed equation to guarantee wireless transmissions with inherent low-probability-of interception (LPI). Secondly, by exploiting the nonunique or instable solutions of an ill-posed problem, two mechanisms are proposed that satisfy the given security requirement while achieving good throughput performance. Our results show that ill-posed problem is not always nasty. We hope that by identifying ill-posed problem inversely, a theoretical framework of enhancing physical-layer security can be constructed eventually.

关键词： Security Communication system security Wireless communication Vectors Extraterrestrial measurements Signal processing

来源：评论

学校读者我要写书评

暂无评论

A partial CSI based Affinity propagation dynamic clustering algorithm

A partial CSI based Affinity propagation Dynamic clustering ...

引用

International Conference on Information Science and Technology (ICIST)

作者： Xiaomin ran Min Tong Youquan Mo National Digital Switching System Engineering & Technological R&D Center Zhengzhou Henan PRC

ISBN: (纸本)9781467327626

The precondition of the whole known channel state information (CSI) is impractical in realistic system. To deal with this problem, a partial CSI based Affinity propagation dynamic clustering algorithm was proposed in this paper. In this algorithm, degree of wiliness to cooperate (dWC) was used to design the input matrix and a cooperation fact was introduced to adjust the number of clusters in clustering results. Assuming every BS has the partial CSI information of the whole system, during each iteration round, responsibility and availability are propagated to accumulate the coordination incidences among BSs. After that, it constructs several clusters of dynamic size. Simulation results show that the capability of this scheme is almost the same as the whole CSI based benefit-tree clustering algorithm. And the convergence iteration rounds increase slowly as the system size enlarging. This exhibits high convergence speed, which is well suited for implementation in realistic system.

关键词： Clustering algorithms Heuristic algorithms Algorithm design and analysis Convergence Collaboration Availability Attenuation

来源：评论

学校读者我要写书评

暂无评论

A polynomial estimation algorithm for PN sequence based on reliability accumulation 3rd

A polynomial estimation algorithm for PN sequence based on r...

引用

International Conference on Information Science and Technology (ICIST)

作者： Meiyue Yang Kaizhi Huang Wenyu Luo National Digital Switching System Engineering & Technological R&D Center Zhengzhou Henan PRC

ISBN: (纸本)9781467327626

To solve the problems of current polynomial estimation algorithms for PN sequence, such as insufficient efficiency and error-tolerance, a novel algorithm based on reliability accumulation is proposed combining BM iterative algorithm based on binary sequence with improved Chase algorithm. Using sequence soft information and constructing the sequence and corresponding polynomial reliability outside BM algorithm, polynomial estimation is accomplished by reliability accumulation. Then, the reliability-accumulated polynomial scale is reduced according to the primitive polynomial characteristic on GF(2) field to improve the estimation accuracy. Simulation results show that the method is not restricted by the tap number of polynomial and has a good performance on estimating the 17th order polynomial under the situation of 15% BEr.

关键词： Polynomials Algorithm design and analysis Estimation Fault tolerance Fault tolerant systems Generators

来源：评论

学校读者我要写书评

暂无评论

3d Image Spectral Segmentation Based on The region Mean Histogram

3D Image Spectral Segmentation Based on The Region Mean Hist...

引用

International Congress on Image and Signal Processing

作者： Lei Zeng Jian Chen Zhongguo Li Bin Yan Xijian Ping National Digital Switching System Engineering &Technology R&D Center Zhengzhou 450002 China

ISBN: (纸本)9781479927654

Spectral segmentation algorithms can extract the global impression of an image and are widely used in many areas and applications related to image segmentation. Traditional spectral algorithms need to construct affinity matrix based on all the voxels in the 3d image and compute the eigenvectors of the matrix to find the global optimum segmentation. With the growing size of the image, the spatial and computational complexities increase egregiously. We propose a novel approach for solving the problem. rather than focusing on voxel of the 3d image, our approach aims at the gray histogram of the mean of the sub regions generated by region growing method. Our method decreases the affinity matrix dimension to 256×256 at most for gray images, and thus decreases the complexity sharply. The spatial and computational complexities are affected slightly by the image size. We have applied this approach to segmenting 3d Printed Circuit Board (PCB) CT images and found the segmentation results to be very encouraging.

关键词： spectral segmentation 3d image segmentation histogram affinity matrix computational complexity

来源：评论

学校读者我要写书评

暂无评论

A multicarrier-based physical layer security scheme for the multicast systems 3rd

A multicarrier-based physical layer security scheme for the ...

引用

International Conference on Information Science and Technology (ICIST)

作者： Tong Lin Kai-Zhi Huang Wen-Yu Luo National Digital Switching System Engineering & Technological R&D Center NDSC Zhengzhou Henan P.R. China

ISBN: (纸本)9781467327626

Traditional physical layer security methods, such as artificial noise, commonly require that the sender has more antennas than that of the receivers, which is not practical in the multicasting system. To solve this problem, a multicarrier-based physical layer security scheme for the multicast systems is proposed, which takes the advantage of both space and frequency domain to form a relatively virtual multi-antenna system. Through subcarrier allocation the existence of null space in every subcarrier channel matrix is guaranteed, so that the artificial noise can be added to ensure a secure communication. Based on the Kuhn-Tucher condition, an optimal power allocation method is also proposed to maximize the security rates under the restriction of total power. Simulation results indicate that this scheme is unlimited by the amount of the sender antennas, and it improves the security rates by 2 bit/s/Hz than the average power allocation method.

关键词： resource management Noise Security Null space Physical layer Base stations Simulation

来源：评论

学校读者我要写书评

暂无评论

An effective community detection algorithm of the social networks

An effective community detection algorithm of the social net...

引用

International Conference on Information Science and Technology (ICIST)

作者： Yuan Huang Wei Hou Xiaowei Li Shaomei Li National Computer Network and Information Security Administration Center Beijing China National Digital Switching System Engineering & Technological R&D Center Zhengzhou

ISBN: (纸本)9781467327626

The traditional social network community detection algorithms generally lack of consideration of link attributes, and full expression using link attribute information model and mechanism. Aiming at this issue, this paper puts forward the community detection algorithm of social network through fusion the link and node attributes. We combine similarity of node attributes between adjacent nodes and link information, and define the similar weights. On this basis, the algorithm realizes community detection of the social network by combining condensation algorithm. Experiments show that effect of this algorithm about social network attribute is remarkable, obviously in attribute-distinct community.

关键词： Communities Social network services Algorithm design and analysis Clustering algorithms detection algorithms Classification algorithms Image edge detection

来源：评论

学校读者我要写书评

暂无评论

Eavesdropping against artificial noise: Hyperplane clustering

Eavesdropping against artificial noise: Hyperplane clusterin...

引用

International Conference on Information Science and Technology (ICIST)

作者： Lu Liu Jin Liang Kaizhi Huang National Digital Switching System Engineering & Technological R&D Center Zhengzhou Henan PRC Information Engineering University Zhengzhou Henan PRC

ISBN: (纸本)9781467327626

Wireless secure communication using artificial noise can guarantee security when the transmitter has more antennas than the eavesdropper. Contrarily, this paper considers the problem of eavesdropping when sufficient antennas were equipped. First, we prove that the receiving scrambling signals are distributed within parallel hyperplanes. Second, based on this signal signature, we propose Hyperplane Clustering algorithm (HC) for real-time eavesdropping. The HC algorithm uses parallel hyperplanes in signal space to approximate receiving signal points, extract signal features and thus intercept messages. Simulations show that the HC algorithm has the benefits of lower complexity, and better anti-noise performance, compared with the existing MUSIC-like algorithms.

关键词： Clustering algorithms Noise Bit error rate Transmitting antennas Approximation algorithms Computational complexity Vectors

来源：评论

学校读者我要写书评

暂无评论

A second-order spatial hopping transmission scheme for physical layer security

A second-order spatial hopping transmission scheme for physi...

引用

International Conference on Information Science and Technology (ICIST)

作者： XinSheng Ji XiaoLei Kang KaiZhi Huang KeMing Ma China National Digital Switching System Engineering & Technological R&D Center Zhengzhou Henan P.R. China China Nat. Digital Switching Syst. Eng. & Technol. R&D Center Zhengzhou China

ISBN: (纸本)9781467327626

The method of physical layer security in wireless relay communication based on cooperative jamming scheme need the channel of legitimate user keep constant. It fails if the eavesdropper has more antennas than the sender. To solve this problem, this paper proposes a second-order spatial hopping transmission scheme. The sender, by the antenna switching and the hopping spatial pattern (HSP), forms equivalent spatial channel of the first-order; Acting as a virtual multi-antenna receivers, relays use time-varying coefficient of beam-forming to weighted-and-forward, form equivalent spatial channel of the second-order. Simulation results show that the scheme proposed achieves low probability of intercept (LPI) in eavesdropper and the power consumption is lower than the method of cooperative jamming.

关键词： relays Antennas Jamming Switches Security Physical layer Bit error rate

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：