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Hiding Information in MPEG Sequences by Using of B-Frames

Wuhan University Journal of Natural Sciences 2012年第3期17卷 238-242页

作者： ZHENG Peng WANG Weihua ZHAO Bo LIU Minzhong School of Computer Wuhan University Wuhan 430072 Hubei China The Key Laboratory of Aerospace Information Security and Trust Computing Ministry of Education Wtthan 430072 Hubei China School of Software Anyang Institute of Technology Anyang 455000 Henan China

In this paper,in order to increase the amount of hiding information,we choose MPEG sequences as carriers and present a practical method focus on the steganographic method in MPEG compressed video ***,there are many B-frames in each *** utilize the B-frames to hide information so that we can increase the amount of hiding information and decrease the tamper of the *** and extracting are performed in compressed video sequences without requiring original *** experimental results show that the proposed method has the characteristics of less tampering on the visual effect and larger hiding capacity without increasing the volume of the carrier file.

关键词： steganography MPEG B-flames motion vector

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Conflict-based belief revision operators in possibilistic logic 26

Conflict-based belief revision operators in possibilistic lo...

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26th AAAI Conference on Artificial Intelligence and the 24th Innovative Applications of Artificial Intelligence Conference, AAAI-12 / IAAI-12

作者： Qi, Guilin Wang, Kewen Key Laboratory of Computer Network and Information Integration of State Education Ministry School of Computer Science and Engineering Southeast University China Key Laboratory of Symbolic Computation and Knowledge Engineering of Ministry of Education Jilin University Changchun 130012 China School of Computing and Information Technology Griffith University Australia

ISBN: (纸本)9781577355687

In this paper, we investigate belief revision in possibilistic logic, which is a weighted logic proposed to deal with incomplete and uncertain information. Existing revision operators in possibilistic logic are restricted in the sense that the input information can only be a formula instead of a possibilistic knowledge base which is a set of weighted formulas. To break this restriction, we consider weighted prime implicants of a possibilistic knowledge base and use them to define novel revision operators in possibilistic logic. Intuitively, a weighted prime implicant of a possibilistic knowledge base is a logically weakest possibilistic term (i.e., a set of weighted literals) that can entail the knowledge base. We first show that the existing definition of a weighted prime implicant is problematic and need a modification. To define a revision operator using weighted prime implicants, we face two problems. The first problem is that we need to define the notion of a conflict set between two weighted prime implicants of two possibilistic knowledge bases to achieve minimal change. The second problem is that we need to define the disjunction of possibilistic terms. We solve these problems and define two conflict-based revision operators in possibilistic logic. We then adapt the well-known postulates for revision proposed by Katsuno and Mendelzon and show that our revision operators satisfy four of the basic adapted postulates and satisfy two others in some special cases. Copyright © 2012, Association for the Advancement of Artificial Intelligence. All rights reserved.

关键词： Problem solving

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Novel steganography using JPEG-compressed images

International Journal of Digital Content Technology and its ...

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International Journal of Digital Content technology and its Applications 2012年第23期6卷 319-325页

作者： Dong, Xiuze Liu, Shu Zhang, Ru Niu, Xinxin Information Security Center Beijing University of Posts and Telecommunications China Beijing Electronic Science and Technology Institute China Key Laboratory of China Information Network Security Ministry of Public Security China

In this paper, a novel steganography based on joint photographic expert-group (JPEG) is proposed. The proposed method embeds two secret bits into each middle frequency coefficient using the least two-significant bits (2-LSBs). For the rest coefficients, the quantization error, resulting from processing the JPEG-compressed image, is compensated while embedding variable-length secret bits. At last, a JPEG stego-image is generated using the quality factor with the value of 100. Experimental results show that, the proposed steganographic method can provide a high information hiding capacity and keep the visual quality well.

关键词： Steganography

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Mining Protocol State Machines by Interactive Grammar Inference

Mining Protocol State Machines by Interactive Grammar Infere...

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第三届数字制造与自动化国际会议

作者： Zhao Zhang Qiao-Yan Wen Wen Tang State Key Laboratory of Network and Switching Technology Beijing University of Posts and Telecommunications IT Security Cooperate Technology Siemens Ltd

Protocol state machine is very essential in network security and implementation fields, however, improper management of software evolution, compounded by changing and imprecise requirements, along with "short time to market" phenomenon, often leads to a lack of up-to-date specifications and they are often characterized by bugs, anomalies and even threads. How to mine the accurate protocol state machine under investigation is still an open problem. We address this problem by using an interactive grammar inference technique as it could generate queries to the protocol implementation in learning process. This paper describes: (1) a flexible method to construct and parse real packet according to the packet format, (2) how to generate packet queries to explore protocol state machine space, (3) applies the QSM technology to mine protocol state machine from network traces. To access the usefulness of our approach, several experiments for different protocols are performed and we could get more objective and accurate results compared with other protocol specification mining methods.

关键词： Protocol State Machine Specification Mining Active Learning Grammatical Inference Protocol Modeling

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An new anonymous authentication scheme for cloud computing

An new anonymous authentication scheme for cloud computing

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2012 7th International Conference on Computer Science and Education, ICCSE 2012

作者： Zhang, Zhi-Hua Li, Jian-Jun Jiang, Wei Zhao, Yong Gong, Bei China Tobacco Zhejiang Iidustrial Co. Ltd. Hangzhou 310009 China College of Computer Science Beijing University of Technology Beijing 100124 China Key Laboratory of Information and Network Security 3rd Research Institute Ministry of Public Security Beijing 100124 China Beijing 100124 China

ISBN: (纸本)9781467302425

Cloud computing is a hot topic of current research, for anonymous authentication is required in many applications scenarios of e-business based on cloud computing, users do not want to expose their identity, users just hope that service providers know they are legitimate users like, for this application, this paper presents a anonymous authentication scheme without certificate, which this scheme avoids the issues how to revocation public key certificate and the escrow problem of key, and then the security of the scheme is analyzed. © 2012 IEEE.

关键词： Cloud computing

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A comparative study of two independent component analysis using reference signal methods

A comparative study of two independent component analysis us...

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8th International Conference on Emerging Intelligent computing technology and Applications, ICIC 2012

作者： Mi, Jian-Xun Yang, Yanxin Bio-Computing Research Center Shenzhen Graduate School Harbin Institute of Technology Shenzhen Guangdong Province China Key Laboratory of Network Oriented Intelligent Computation Shenzhen Guangdong Province China Faculty of Engineering and Technology Yunnan Agriculture University Kunming Yunnan Province China

ISBN: (纸本)9783642318368

Independent Component Analysis (ICA) using reference signal is a useful tool for extracting a desired independent component (IC). Reference signal is served asa priori information to conduct ICA to converge to the local extreme point related to a desired IC. There are two methods can perform ICA using reference signal, namely ICA with reference (ICA-R) and fast ICA with reference signal (FICAR). In this paper, we present a comparative assessment of the two methods to highlight their respective characteristics. © 2012 Springer-Verlag.

关键词： Independent component analysis

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Research on hardware security of embedded system in cloud environment

Research on hardware security of embedded system in cloud en...

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2012 2nd International Conference on key Engineering Materials, ICKEM 2012

作者： Li, Jing Zhang, Huanguo Zhao, Bo Guo, Xi He, Fan School of Computer Wuhan University Wuhan 430072 Hubei China Key Laboratory of Aerospace Information Security and Trusted Computing of Ministry of Education Wuhan University Wuhan 430072 Hubei China School of Computer Science and Technology Wuhan University of Technology 1040 Heping Road Wuhan 430063 China

ISBN: (纸本)9783037853825

Cloud computing is an important innovation of current computing models. At present, the research on the security of cloud computing is mainly concentrated on PCs and servers. The security of embedded system in cloud environment does not win enough attention. This paper analysis the security threats of it, and proposes a Secure Hardware Model to provide a tamper-resistant and more reliable hardware embedded platform in cloud environment. Our model adds some new components to traditional embedded system, controls the start sequence of platform's components, verifies the integrity of crucial information for embedded platform and recovers the system if necessary. Our implementation demonstrates the feasibility of Secure Hardware Model, it enhance the secure and reliable boot of embedded system. With the constant development and application of embedded system in cloud computing field, our research will influence cloud computing greatly. © (2012) Trans Tech Publications.

关键词： Embedded systems

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Selective opening chosen ciphertext security directly from the DDH assumption

Selective opening chosen ciphertext security directly from t...

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6th International Conference on network and System security, NSS 2012

作者： Liu, Shengli Zhang, Fangguo Chen, Kefei Dept. of Computer Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China School of Information Science and Technology Sun Yat-sen University Guangzhou 510006 China State Key Laboratory of Information Security Institute of Software Chinese Academy of Sciences China Shanghai Key Laboratory of Scalable Computing and Systems Shanghai China

ISBN: (纸本)9783642346002

Chosen-ciphertext security has been well-accepted as a standard security notion for public key encryption. But in a multi-user surrounding, it may not be sufficient, since the adversary may corrupt some users to get the random coins as well as the plaintexts used to generate ciphertexts. The attack is named "selective opening attack". We study how to achieve full-fledged chosen-ciphertext security in selective opening setting directly from the DDH assumption. Our construction is free of chameleon hashing, since tags are created for encryptions in a flexible way to serve the security proof. © 2012 Springer-Verlag.

关键词： Public key cryptography

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Multi-Layer Synthesis of HighlyStructured Texture

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Wuhan University Journal of Natural Sciences 2012年第4期17卷 302-308页

作者： TANG Li YU Rongwei GU Yuanting YUAN Jie DU Gong School of Computer Science and Engineering ChangshuInstitute of Technology Changshu 215500 Jiangsu China State Key Laboratary of Software Engineering WuhanUniversity Wuhan 430072 Hubei China Key Laboratory of Aerospace Information Security andTrust Computing Ministry of Education Wuhan 430072 HubeiChina Institute of Software Chinese Academy of Sciences Beijing100080 Beijing China

In this paper, a novel concept of multilayer synthesis and a general framework for texture synthesis method are presented. Within this framework, we first decompose the texture into the supposed pattern layer and material layer in the frequency domain by an E-texton extracting algorithm, then manipulate and extend them respectively according to their own personalities, and finally merge the newly synthesized pattern layer and material layer again to generate the final output. Experiment results show that our method not only greatly improves the synthesis quality for those cases that single-layer synthesis cannot handle well but also provides an ability of achieving various special synthesis effects.

关键词： texture synthesis texture layer multilayer synthesis

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A parallel NURBS-based isogeometric analysis framework on multi-core CPUs

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Journal of Computational Information Systems 2012年第16期8卷 6589-6600页

作者： Guo, Licai Huang, Zhangjin Gu, Naijie School of Computer Science and Technology University of Science and Technology of China China Key Laboratory of Software in Computing and Communication Anhui China USTC-SICT Joint Laboratory on Network and Communication China

A parallel framework for NURBS-based isogeometric analysis on multi-core cpus is presented in this paper. The framework is composed of two parts: (1) construction of the stiffness matrix and right hand side vector;(2) a parallel sparse solver. We analyze the properties of NURBS basis, use the ELLPACK format to store the stiffness matrix. The parallel strategy is dividing the matrix and vectors into disjoint parts. Each core computes one part in parallel. We test the effectiveness and efficiency of the framework on an 8-core machine and a 48-core machine. The framework solves the 2-d poisson equation and can solve 1.05 million degrees of freedom in about 22 seconds using 32 cores. The speed-up of the construction reaches 28.3 using 32 cores. © 2012 Binary Information Press.

关键词： Stiffness matrix

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