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1st International Conference on Instrumentation and Measurement, computer, Communication and Control, IMCCC2011

作者： Ming, Liang Wang, Dongxia Zhang, Lufeng Kuang, Xiaohui Tang, Jian Wang, Chunlei Science and Technology on Information System Security Laboratory Beijing China Beijing Institute of System and Engineering Beijing China Department of Computer Science and Technology Tsinghua University Beijing China

ISBN: (纸本)9780769545196

In order to set up universal criteria for measuring and evaluating network security and survivability, this paper presents a novel index system. This index system was built according to the Protection-Detection-Response (PDR) security model and the Resistance-Recognition-Recovery (R3) survivability principle of network in the presence of attacks, failures, or accidents. And all the 24 metrics in the index system are used to cover the characters of network security and survivability. The index system is organized with three-layer structure like a tree. The first layer, i.e. root node, is called network security and survivability. The second layer includes three indexes, i.e. resistance metric, awareness metric, and recovery metric. The third layer includes 20 indexes abstracted from different network layers, survivability characters, and survivability methods and so on. This novel index system is quantifiable, universal, consistent, compatible, and fine-scale, which is suitable for different network systems. At last, a case for how to using these index system to measure network security and survivability is also given. © 2011 IEEE.

关键词： Network security

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An overview of bootkit attacking approaches

An overview of bootkit attacking approaches

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2011 7th International Conference on Mobile Ad-hoc and Sensor Networks, MSN 2011

作者： Li, Xiang Wen, Yan Huang, Min Huan Liu, Qiang Beijing Institute of System Engineering Beijing China National Key Laboratory of Science and Technology on Information System Security Beijing China

ISBN: (纸本)9780769546100

Boot kit, as an innovative root kit technology, transfer its storage location from the file system to the hardware store, and activates itself while or even before the operating system kernel is loaded. Therefore, boot kit can tamper the operating system and control the whole computer system. Compared to classic malware, it achieves a more powerful capability of hiding and controlling. This paper takes an overview of existing various boot kit technologies and summarizes their technical characteristics. This opens a door to the malware defenders for preventing the computer systems from boot kit. © 2011 IEEE.

关键词： Malware

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Using random walks for multi-label classification 11

Using random walks for multi-label classification

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20th ACM Conference on information and Knowledge Management, CIKM'11

作者： Wang, Chaokun Zheng, Wei Liu, Zhang Bai, Yiyuan Wang, Jianmin School of Software Tsinghua University Beijing 100084 China Department of Computer Science and Technology Tsinghua University China Tsinghua National Laboratory for Information Science and Technology China Key Laboratory for Information System Security Ministry of Education China

ISBN: (纸本)9781450307178

The Multi-Label Classification (MLC) problem has aroused wide concern in these years since the multi-labeled data appears in many applications, such as page categorization, tag recommendation, mining of semantic web data, social network analysis, and so forth. In this paper, we propose a novel MLC solution based on the random walk model, called MLRW. MLRW maps the multi-labeled instances to graphs, on which the random walk is applied. When an unlabeled data is fed, MLRW transforms the original multi-label problem to some single-label subproblems. Experimental results on several real-world data sets demonstrate that MLRW is a better solution to the MLC problems than many other existing multi-label classification methods. © 2011 ACM.

关键词： Random processes

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Linear complexity of sequences produced by single cycle T-function

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The Journal of China Universities of Posts and Telecommunications 2011年第4期18卷 123-128页

作者： WANG Yan HU Yu-pu LI Shun-bo YANG Yang Key Laboratory of Computer Networks and Information Security Ministry of Education Xidian University Xi'an 710071 China Department of Mathematics Xi'an University of Architecture and Technology Xi'an 710055 China

Four kinds of sequences generated by single cycle triangular function （T-function） are investigated to check the possibility for a single cycle T-function to be a cryptographic component in stream ciphers. Based on the special properties of single cycle T-function and an algorithm due to Wei, linear complexities of these four kinds of sequence are all acquired. The results show that single cycle T-function sequences have high linear complexity. Therefore, T-function satisfies the essential requirements being a basic component of stream cipher.

关键词： stream cipher single cycle T-function linear complexity

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Deterministic Pilot Design for MIMO OFDM system Based on Compressed Sensing

Deterministic Pilot Design for MIMO OFDM System Based on Com...

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2012 IEEE 14th International Conference on Communication technology

作者： Nan Jing Weihong Bi Lin Wang School of Information Science and Engineering Yanshan University The Key Laboratory for Special Fiber and Fiber Sensor of Hebei Province School of Information Science and Engineering Yanshan University The Key Laboratory for Computer Virtual Technology and System Integration of Hebei Province

ISBN: (纸本)9781467321006

We consider the problem of pilot design for sparse multipath channel estimation in multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system in this *** order to reconstruct MIMO sparse channel,the prevalent compressed sensing (CS) theory is *** to random pilot construction,a deterministic pilot de- sign method is exploited to form the measurement matrix by deterministically extracting some rows of Fourier matrix that satisfies Restricted Isometry Property (RIP).Two families of continuous functions,namely f1 -SL0 and f 2-SL0,are investi- gated in this paper to approximate A 0norm for MIMO sparse channel *** results suggest that the de- terministic pilot design scheme performs as well as the random one at both low and high signal noise ratio (SNR).Moreover,f1 - SL0 and f 2-SL0 outperform A 1-dantzig algorithm with faster running time and better anti-noisy performance.

关键词： sparse channel estimation,deterministic pilot design,compressed sensing,MIMO OFDM

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MUSIZ: A generic framework for music resizing with stretching and cropping 11

MUSIZ: A generic framework for music resizing with stretchin...

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19th ACM International Conference on Multimedia ACM Multimedia 2011, MM'11

作者： Zhang, Liu Wang, Chaokun Ba, Yiyuan Wang, Hao Wang, Jianmin Department of Computer Science and Technology Tsinghua University China School of Software Tsinghua University Beijing 100084 China Tsinghua National Laboratory for Information Science and Technology China Key Laboratory for Information System Security Ministry of Education China Key Laboratory of Intelligent Information Processing Institute of Computing Technology CAS China

ISBN: (纸本)9781450306164

Content-aware music adaption, i.e. music resizing, in temporal constraints starts drawing attention from multimedia communities because of the need of real-world scenarios, e.g. animation production and radio advertisement production. The goal of music resizing is to change the length of a music track to a user preferred length using a series of basic operations, e.g. compression, prolonging, cropping and repeating. The only existing music resizing approach so far, called LyDAR, suffers from some limitations. For example, it cannot support prolonging a music track and cannot compress music pieces with very small stretch rates. In this paper, we propose MUSIZ, a generic framework for MUsic reSIZing. Observing the diversity of quality degradation for different segments, we propose the concept of stretch-resistance to measure the degree of quality degradation after a segment is stretched. MUSIZ stretches high stretch-resistance segments intensively and relieves low stretch-resistance segments to reduce the negative impact on the stretched music piece. For short length resizing requests, we develop a contiguity-preservative cropping algorithm to remove segments before stretching, while smoothing the abrupt change at the joint between two segments. Comprehensive experimental results show that MUSIZ is superior to the existing approaches. © 2011 ACM.

关键词： stretch-resistance music retargeting music resizing

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Real-time volume caustics with image-based photon tracing

Real-time volume caustics with image-based photon tracing

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12th International Conference on computer-Aided Design and computer Graphics, CAD/Graphics 2011

作者： Wang, Yuxiang Wang, Bin Chen, Li School of Software Tsinghua University China Department of Computer Science and Technology Tsinghua University China Laboratory for Information System Security Ministry of Education of China China Tsinghua National Laboratory for Information Science and Technology China

ISBN: (纸本)9780769544977

Rendering of volume caustics in participating media is often expensive, even with different acceleration approaches. Basic volume photon tracing is used to render such effects, but rather slow due to its massive quantity of photons to be traced. In this paper we present an image-based volume photon tracing method for rendering volume caustics at real-time frame rates. Motivated by multi-image based photon tracing, our technique uses multiple depth maps to accelerate the intersection test procedure, achieving a plausible and fast rendering of volume caustics. Each photon dynamically selects the depth map layer for intersection test, and the test converges to an approximate solution using image space methods in a few recursions. This allows us to compute photon distribution in participating media while avoiding massive computation on accurate intersection tests with scene geometry. We demonstrate that our technique, combined with photon splatting techniques, is able to render volume caustics caused by multiple refractions. © 2011 IEEE.

关键词： Photons

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WiFace:A Secure GeoSocial Networking system Using Wi-Fi Based Multihop MANET

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ZTE Communications 2011年第1期9卷 27-32页

作者： Lan Zhang Xuan Ding Zhiguo Wan Ming Gu Xiangyang Li Key Laboratory of Information System Security Tsinghua University Department of Computer Science Illinois Institute of Technology

A number of mobile Online Social Networking （OSN） services have appeared in the market in recent times. While most mobile systems benefit greatly from cloud services, centralized servers and communications infrastructure is not always available. Nor are location-based services offered to mobile devices without GPS. To take advantage of cloud and to address these problems, a Wi-Fi based multihop networking system called MoNet is proposed. On top of MONET we propose a privacy-aware geosocial networking service called WiFace. Where there is no infrastructure, a distributed content sharing protocol significantly shortens the relay path, reduces conflicts, and improves data availability. Furthermore, a security mechanism is developed to protect privacy. Comprehensive experiments performed on MoNet show that the system is more than sufficient to support social networking and even audio and video applications.

关键词： Wi-Fi social network privacy MANET WiFace

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Block Cipher Design:Generalized Single-Use-Algorithm Based on Chaos

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Tsinghua science and technology 2011年第2期16卷 194-206页

作者：赵耿陈关荣方锦清徐刚 Key Laboratory of Information Security and Secrecy Beijing Electronic Science and Technology Institute Department of Electronic Engineering City University of Hong Kong China Institute of Atomic Energy School of Information Engineering University of Science and Technology Beijing

The idea of using a one-time-one-key design has been widely applied in conventional cryptography. With the security theory of conventional cryptology, encryption algorithms are made public while all the secrets are encoded only in the keys. This paper applies chaos theory to conventional cryptography to develop a one-time-one-algorithm design. A general theory is given to generate the clock key, substitution box, permutation box and operational sign functions for a one-time-one-algorithm scheme. This scheme is then implemented in a system to manage the tradeoff between speed and the security of the encryption algorithm.

关键词： chaotic cryptography block cipher one-time-one-algorithm one-time-one-key

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Parallel spatial hashing for collision detection of deformable surfaces

Parallel spatial hashing for collision detection of deformab...

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12th International Conference on computer-Aided Design and computer Graphics, CAD/Graphics 2011

作者： Fan, Wenshan Wang, Bin Zhou, Jianliang Sun, Jiaguang School of Software Tsinghua University China Beijing Aerospace Control Center China Department of Computer Science and Technology Tsinghua University China Key Laboratory for Information System Security Ministry of Education of China China Tsinghua National Laboratory for Information Science and Technology China

ISBN: (纸本)9780769544977

We present a fast collision detection method for deformable surfaces with parallel spatial hashing on GPU architecture. The efficient update and access of the uniform grid are exploited to accelerate the performance in our method. To deal with the inflexible memory system, which makes the building of stream data a challenging task on GPU, we propose to subdivide the whole workload into irregular segments and design an efficient evaluation algorithm, which employs parallel scan and stream compaction, to build the stream data in parallel. The load balancing is a key aspect that needs to be considered in the SIMD parallelism. We break the heavy and irregular collision computation down into lightweight part and heavyweight part, ensuring the later perfectly run in load balancing manner with each concurrent thread processes just a single collision. In practice, our approach can perform collision detection in tens of milliseconds on a PC with NVIDIAGTX 260 graphics card on benchmarks composed of millions of triangles. The results highlight our speedups over prior CPU-based and GPU-based algorithms. © 2011 IEEE.

关键词： Graphics processing unit

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