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Attribute Based DRM Scheme with Dynamic Usage Control in Cloud Computing

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china Communications 2014年第4期11卷 50-63页

作者： HUANG Qinlong Information Security Center Beijing University of Posts and Telecommunications Beijing 100876 China national engineering laboratory for disaster backup and recovery Beijing University of Posts and Telecommunications Beijing 100876 China

In order to achieve fine-grained access control in cloud computing,existing digital rights management(DRM) schemes adopt attribute-based encryption as the main encryption ***,these schemes suffer from inefficiency and cannot support dynamic updating of usage rights stored in the *** this paper,we propose a novel DRM scheme with secure key management and dynamic usage control in cloud *** present a secure key management mechanism based on attribute-based encryption and proxy *** the users whose attributes satisfy the access policy of the encrypted content and who have effective usage rights can be able to recover the content encryption key and further decrypt the *** attribute based mechanism allows the content provider to selectively provide fine-grained access control of contents among a set of users,and also enables the license server to implement immediate attribute and user ***,our scheme supports privacy-preserving dynamic usage control based on additive homomorphic encryption,which allows the license server in the cloud to update the users' usage rights dynamically without disclosing the *** analytical results indicate that our proposed scheme is secure and efficient.

关键词： digital rights management cloud computing usage control attribute-based encryption homomorphic encryption

Construction of Convolutional Network Coding for Cyclic Multicast Networks

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Construction of Convolutional Network Coding for Cyclic Mult...

DYNAMIC ONLINE TRAFFIC IDENTIFICATION SCHEME BASED ON DATA STREAM CLUSTERING ALGORITHM

2010 IEEE 2nd 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 Center,State Key laboratory of Networking and Switching Technology, beijing university of posts and telecommunications,beijing 100876,china 2 Key laboratory of Network and Information Attack and Defence Technology of MOE, beijing university of posts and telecommunications,beijing 100876,china 3 national engineering laboratory for disaster backup and recovery, beijing university of posts and telecommunications,beijing 100876,china.

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

CYCLIC REDUNDANCY CODE CHECK ALGORITHM BASED ON SMALL LOOKUP TABLE

2011 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 Security Center beijing university of posts and telecommunications beijing 100876 china 2 national engineering laboratory for disaster backup and recovery beijing 100876 china 3 beijing Safe-Code Technology Co.Ltd. beijing 100876 china

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

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CYCLIC REDUNDANCY CODE CHECK ALGORITHM BASED ON SMALL LOOKUP...

基于纹理特征的H.264/AVC顽健视频水印算法

2009 IEEE International Conference on Communication Technology and Applications（ICCTA2009）

作者： Jianfen Peng~(1 2 3) Yajian Zhou~(1 2 3) Yixian Yang~(1 2 3) 1national engineering laboratory for disaster backup and recovery beijing university of posts and telecommunications 2Information Security Center State Key laboratory of Networking and Switching Technology beijing university of posts and telecommunications 3Key laboratory of network and information attack & defence technology of MOE beijing university of posts and telecommunications

＜正＞Real time and low occupation of memory must be satisfied in the error controlling of computer *** redundancy code Generation algorithm based on small lookup table（CRCGA） is presented in this paper,which is based on "slicing-by -4" algorithm proposed by *** ***. and uses the distributive property of mod function in modulo-2 arithmetic to reduce the size of cache demanded by the algorithm by *** reads 32bits at a time,only needs 2-KByte cache *** results show that CRCGA can be applied to small control equipment in distributed control system.

关键词： algorithms cyclic redundancy codes precomputation lookup table

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通信学报 2012年第3期33卷 82-89页

作者：张维纬张茹刘建毅钮心忻杨义先北京邮电大学信息安全中心北京100876 北京邮电大学灾备技术国家工程实验室北京100876 信息网络安全公安部重点实验室(公安部第三研究所) 上海201204

在分析现有视频水印算法的基础上,结合H.264压缩编码标准的特性,提出了一种新的基于纹理特征的视频顽健水印算法。算法先对当前帧4×4块进行整数离散余弦变换,判断其是否是纹理块,再采用能量差的方式自适应选择系数嵌入水印。实验结果表... 详细信息

在分析现有视频水印算法的基础上,结合H.264压缩编码标准的特性,提出了一种新的基于纹理特征的视频顽健水印算法。算法先对当前帧4×4块进行整数离散余弦变换,判断其是否是纹理块,再采用能量差的方式自适应选择系数嵌入水印。实验结果表明,该算法对视频质量和码率的影响较小,并且能有效抵抗高斯噪声、低通滤波、重编码等常见的视频水印攻击。

关键词：视频顽健水印能量差 H.264/AVC 纹理特征

An Audio Zero-Watermark Scheme Based on Energy Comparing

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china Communications 2014年第7期11卷 110-116页

作者： YANG Yu LEI Min CHENG Mingzhi LIU Bohuai LIN Guoyuan XIAO Da Information Security Center Beijing University of Posts and Telecommunications Beijing China College of Information engineering Beijing Institute of Graphic Communication Beijing China national engineering laboratory for disaster backup and recovery Beijing China School of Computer Science and Technology China University of Mining and Technology China

Zero-watermark technique,embedding watermark without modifying carriers,has been broadly applied for copyright protection of ***,there is little research on audio *** paper proposes an audio zero-watermark scheme based on energy relationship between adjacent audio *** use of discrete wavelet transformation(DWT),it gets power approximations,or energies,of audio ***,it extracts the audio profile,*** zero-watermark,according to the relative size of energies of consecutive *** experimental results demonstrate that the proposed scheme is robust against general malicious attacks including noise addition,resampling,low-pass filtering,etc.,and this approach effectively solves the contradiction between inaudibility and robustness.

关键词： zero-watermark audio water-marking scheme energy comparing

Content Addressable Storage Optimization for Desktop Virtualization Based disaster backup Storage System

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china Communications 2012年第7期9卷 1-13页

作者： Ruan Li Xiao Lim in Zhu Mingfa State Key laboratory of Software Development Environment Beijing 100191 P. R. China School of Computer Science and engineering Beihang University Beijing 100191 P. R. China

This paper proposes a content addres sable storage optimization method, VDeskCAS, for desktop virtualization storage based disaster backup storage system. The method implements a blocklevel storage optimization, by employing the algorithms of chunking image file into blocks, the blockffmger calculation and the block dedup li cation. A File system in Use Space （FUSE） based storage process for VDeskCAS is also introduced which optimizes current direct storage to suit our content addressable storage. An interface level modification makes our system easy to extend. Experiments on virtual desktop image files and normal files verify the effectiveness of our method and above 60% storage volume decrease is a chieved for Red Hat Enterprise Linux image files. Key words： disaster backup; desktop virtualization; storage optimization; content addressable storage

关键词： disaster backup desktop virtualization storage optimization content addressable storage