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Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2014年 8363卷 1-24页

作者： Liu, Feng Yan, Wei Q. Li, Peng Wu, Chuankun State Key Laboratory of Information Security Institute of Information Engineering Chinese Academy of Sciences Beijing 100093 China School of Computing and Mathematical Sciences Auckland University of Technology 1142 New Zealand Department of Mathematics and Physics North China Electric Power University Baoding Hebei 071003 China

Visual Cryptography (VC) is a powerful technique that combines the notions of perfect ciphers and secret sharing in cryptography with that of raster graphics. A binary image can be divided into shares that are able to be stacked together so as to approximately recover the original image. VC is a unique technique in the sense that the encrypted message can be decrypted directly by the Human Visual System (HVS). The distinguishing characteristic of VC is the ability of secret restoration without the use of computation. However because of restrictions of the HVS, pixel expansion and alignment problems, a VC scheme perhaps can only be applied to share a small size of secret image. In this paper, we propose a general method to let the VC shares carry more secrets, the technique is to use cypher output of private-key systems as the input random numbers of VC scheme, meanwhile the encryption key could be shared, the shared keys could be associated with the VC shares. After this operation, VC scheme and secret sharing scheme are merged with the private-key system. Under this design, we implement a (k,t,n)-VC scheme. Compared to those existing schemes, our approach could greatly enhance the ability of current VC schemes and could cope with pretty rich secrets. © 2014 Springer-Verlag Berlin Heidelberg.

关键词： Binary images

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The Synchronization Treatment in Implementing Data-Parallel programming languages on CPUs

The Synchronization Treatment in Implementing Data-Parallel ...

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International Workshop on Intelligent Communication and Social Networks

作者： Feng Yue Jianmin Pang Rongcai Zhao Chao Dai State Key Laboratory of Mathematical Engineering and Advanced Computing

ISBN: (纸本)9781479909735

When implementing data-parallel programming languages such as CUDA, OpenCL on CPUs, synchronization must be simulated correctly. The basic method is thread-based, which means all thread must execute one instruction in turn before execute the next one. In this paper, we propose function splitting to treat synchronization in a coroutine style but not just thread-based. It splits the data-parallel function presented by low-level intermediate representation into several parts by simulating synchronization. We evaluate our method in translating PTX kernels to multi-core CPUs, the result of which shows this method could promotes performance by 15% compared to thread-based method. Our main contribution is a generous synchronization treatment that performs on low-level intermediate code given by a control flow graph in SSA form.

关键词： Data Parallelism Synchronization Thread Function Splitting Low-Level Intermediate Code SSA

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Research on aggregated multicast based on wide-sense circuit tree

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2013 3rd International Symposium on Chemical engineering and Material Properties, ISCEMP 2013

作者： Zhang, Xiao Bo Lan, Ju Long Chen, Yue Li, Chao Ling State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou 450000 China China National Digital Switching System Engineering and Technological Research Center Zhengzhou 450000 China

ISBN: (纸本)9783037858363

To achieve the scalability and Quality of Service (QoS) of multicast service, a Wide-Sense Circuit Tree (WSCT) based on Aggregated Multicast Tree is proposed. By aggregating multicast traffics of the same class, WSCT can efficiently reduce the forwarding states of routing nodes and then improve the multicast scalability. By using Wide-Sense Circuit (WSC) to transfer data packages, MSCT can also improve the package forwarding efficiency and provide QoS. © (2013) Trans Tech Publications, Switzerland.

关键词： Quality of service

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Research on external storages management of virtual machine

Research on external storages management of virtual machine

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2nd International Conference on Mechanical engineering, Industrial Electronics and Informatization, MEIEI 2013

作者： Wang, Xiao Rui Wang, Qing Xian China National Digital Switching System Engineering and Technological Research Center Zhengzhou 450002 China State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou 450002 China

ISBN: (纸本)9783037858905

To deal with the problem of external storages management in multiple virtual machines environment, a system design scheme of external storages management is proposed with the idea of virtual memory management and protocol of object-based Network storage. Experiments showed that virtual partition could be created and repealed dynamic, the capability of partition could be increased dynamic with practical requirement, and write protection based partition could also be realized, flexibility of external storages management is enhanced greatly and usage efficiency also increased notably. © (2013) Trans Tech Publications, Switzerland.

关键词： Network security

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Method based on GSCPN for network vulnerability analysis

Journal of Software

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Journal of Software 2013年第8期8卷 2032-2038页

作者： Gao, Xiang Zhu, Yue-Fei Fei, Jin-Long Han, Tao State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou 450002 China

With the development of network security research, network attack modeling and analysis techniques have been paid more and more attention. A generalized stochastic colored Petri Net (GSCPN) Model is proposed. To each attack, a GSCPN model is constructed to describe the relation of components graphically. Algorithm to construct a composite attack and method for network vulnerability analysis are delivered also. The exploitation cost of vulnerabilities is estimated. The method is relatively simple, which is different from traditional method. The network example further validates the proposed method for network vulnerability analysis. © 2013 ACADEMY PUBLISHER.

关键词： Network security

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Research on Stream Cipher Model Based on Chaos Theory

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International Journal of Technology Management 2013年第2期 91-93页

作者： Sun Wenjie State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou Henan 102206

Chaos is a similar and random process which is very sensitive to initial value in deterministic system. It is a performance of nonlinear dynamical system with built-in randomness. Combined with the advantages and disadvantages of the present chaos encryption model, the paper proposes a chaotic stream cipher model based on chaos theory, which not only overcomes finite precision effect, but also improves the randomness of chaotic system and output sequence. The Sequence cycle theory generated by the algorithm can reach more than 10600 at least, which completely satisfies the actual application requirements of stream cipher system.

关键词： chaos theory stream cipher algorithm

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A cost model for automatic OpenMP parallelization

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Ruan Jian Xue Bao/Journal of Software 2014年 25卷 101-110页

作者： Li, Yan-Bing Zhao, Rong-Cai Liu, Xiao-Xian Zhao, Jie PLA Information Engineering University Zhengzhou450001 China State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou450001 China Logistics Information Center Guangzhou Military Region Joint Logistics Department Guangzhou510000 China

Existing OpenMP cost models does not give enough thought to the implementation details of OpenMP programs so they cannot be applied widely to different types of parallel loops. To solve this problem, this study extends the cost model in the most advanced product-level optimizing compiler Open64. Targeting single candidate parallel loop, it establishes a cost model suite for the OpenMP benefit analysis. Besides improving the original DOALL-loop faced cost model in the Open64 compiler, two additional models which are also designed for DOACROSS and DSWP (Decoupled Software Pipelining) loops respectively. The experimental results show that the proposed cost model suite can simulate the execution cost of parallel programs very well, and therefore can better support cost evaluation of OpenMP parallelization. ©2014 ISCAS.

关键词： Cost benefit analysis

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GramFuzz: Fuzzing testing of web browsers based on grammar analysis and structural mutation

GramFuzz: Fuzzing testing of web browsers based on grammar a...

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2013 2nd International Conference on Informatics and Applications, ICIA 2013

作者： Guo, Tao Zhang, Puhan Wang, Xin Wei, Qiang China Information Technology Security Valuation Center Beijing China State Key Laboratory of Mathematical Engineerning and Advanced Computing Zhenzhou China

ISBN: (纸本)9781467352550

Fuzz testing is an automated black-box testing technique providing random data as input to a software system in the hope to find vulnerability. In order to be effective, the fuzzed input must be common enough to pass elementary consistency checks. Web Browser accepts JavaScript, CSS files as well as the html as input, which must be considered in fuzzing testing, while traditional fuzzing technology generates test cases using simple mutation strategies, ignoring the grammar and code structure. In this article, vulnerability patterns are summarized and a new fuzzing testing method are proposed based on grammar analysis of input data and mutation of code structure. Combining methods of generation and mutation, test cases will be more effective in the fuzzing testing of web browsers. Applied on the Mozilla and IE web browsers, it discovered a total of 36 new severe vulnerabilities(and thus became one of the top security bug bounty collectors within this period). © 2013 IEEE.

关键词： Web browsers

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Embedding change rate estimation based on ensemble learning 13

Embedding change rate estimation based on ensemble learning

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1st ACM Workshop on Information Hiding and Multimedia Security, IH and MMSec 2013

作者： Li, Zhenyu Hu, Zongyun Luo, Xiangyang Lu, Bin State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou 450002 China Zhengzhou Institute of Information Science and Technology Zhengzhou 450002 China State Key Laboratory of Information Security Institute of Information Engineering Chinese Academy of Sciences Beijing 100093 China

ISBN: (纸本)9781450320818

In order to achieve higher estimation accuracy of the embedding change rate of a stego object, an ensemble learning-based estimation method is presented. First of all, a framework of embedding change rate estimation based on estimator ensemble is proposed. Then an algorithm of building the estimator ensemble, the core of the framework, is concretely described. Finally, a pruning method for estimator ensemble is proposed in consideration of both the diversity among the base estimators and accuracy of each of them. The experimental results for three modern steganographic algorithms (nsF5, PQ and PQt) indicate that the proposed method acquired better performance than the existed typical method. Furthermore, the pruned estimator ensemble with less base estimators maintained, even slightly improved the estimation accuracy, compared to the one without purning. © 2013 ACM.

关键词： Steganography

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An Automatic Parallel-Stage Decoupled Software Pipelining Parallelization Algorithm Based on OpenMP

An Automatic Parallel-Stage Decoupled Software Pipelining Pa...

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IEEE International Conference on Trust, Security and Privacy in computing and Communications (TrustCom)

作者： Xiaoxian Liu Rongcai Zhao Lin Han Peng Liu State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou China

ISBN: (纸本)9781479914449

While multicore processors increase throughput for multi-programmed and multithreaded codes, many important applications are single threaded and thus do not benefit. Automatic parallelization techniques play an important role in migrating singe threaded applications to multicore platforms. Unfortunately, the prevalence of control flow, recursive data structures, and general pointer accesses in ordinary programs renders the traditional automatic parallelization techniques unsuitable. Parallel-Stage Decoupled Software Pipelining (PS-DSWP) is proposed to exploit fine-grained pipeline parallelism lurking in ordinary programs with the existence of all kinds of dependences, including arbitrary control dependences, at the instruction level. But it requires knowledge of architectural properties and hardware support of a communication channel and two special instructions. We propose an improved PS-DSWP algorithm based on OpenMP in this paper. It is implemented without relying on CPU architectures by using a high level intermediate representation. Moreover, the Program Dependence Graph (PDG) used in the algorithm is built based on the basic blocks, which exploits coarser-grained parallelism than the original PS-DSWP transformation with PDG based on instructions. OpenMP is employed in our algorithm to assign task and implement synchronization among threads while avoiding dependence on hardware support. We evaluate the loops with complex memory patterns and control flow, which cannot be dealt with by traditional techniques, on multicore platform. As a result, they can be parallelized and gain significant performance improvement with our algorithm. We obtain a maximum speedup as high as 2.07x and on average 1.39x with 5 threads.

关键词： Instruction sets Synchronization Pipeline processing Multicore processing Merging

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