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Journal of Software 2011年第9期6卷 1805-1812页

作者： Hu, Yuping Wang, Zhijian Liu, Hui Guo, Guangjun Guangdong Province Key Lab of EC Market Application Technology GuangDong University of Business Studies Guangzhou 510320 China Hangzhou Key Lab of E-Business and Information Security Hangzhou Normal University Hangzhou 310036 China Department of Electronics and Communication Engineering Changsha College Changsha Hunan 410003 China Department of Computer Science and Technology Hunan Institute of Humanities Science and Technology Loudi Hunan 41700 China

In this paper, a robust watermarking algorithm against geometric distortions and common signal processing is proposed. This algorithm is based on two method to solve the synchronization of the original watermarking images and test images in the wavelet domain watermarking. One method, which estimates rotation and scaling based on embedding a template in a circle of middle frequency in DFT, One method which estimates translation based on extracting an invariant centroid from a restricted area inside the image. In the embedding process, a watermark is embedded adaptively in low band of DWT domain, according to the conceal quality of Human Visual System (HVS).The experiment results show robustness against common signal processing attacks, several geometric distortions and some combination attacks, Also the comparison with the prior algorithms shows the better performance of the proposed algorithm. © 2011 ACADEMY PUBLISHER.

关键词： Geometry

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Short-ciphertext and BDH-based CCA2 secure certificateless encryption

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Science China(information Sciences) 2010年第10期53卷 2005-2015页

作者： SUN YinXia & LI Hui 1 key lab of computer networks and information security, Ministry of Education, Xidian University, Xi’an 710071, China 1. Key Lab of Computer Networks and Information Security Ministry of Education Xidian University Xi’an 710071 China

Certificateless public key cryptosystem actually belongs to identity based cryptography, with an attractive characteristic that the private key generator does not have access to any user’s full private key. Most of the existing certificateless encryption schemes employ the FO-technique and/or strong assumptions, for example GBDH, Gap-BDH and BDHI, to achieve adaptive chosen ciphertext security (CCA2 security). However, FO-technique introduces redundancy in ciphertext, and strong assumption reduces our confidence in the security of the underlying scheme. In this paper, we present a short-ciphertext CCA2 secure certificateless encryption scheme under the standard BDH assumption. Due to short ciphertext and convincing security, our scheme has practical value.

关键词： identity based cryptography certificateless encryption bilinear pairing BDH problem twin BDH problem random oracle

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Secure Certificateless Encryption with Short Ciphertext

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电子学报(英文版) 2010年第2期19卷 313-318页

作者： SUN Yinxia ZHANG Futai School of Mathematics and Computer Science Nanjing Normal University Nanjing China Key Lab of Computer Networks and Information Security Ministry of Education Xidian University Xi'an China

Certificateless public key cryptography was introduced to solve the key escrow problem in identity based cryptography while enjoying the most attractive certificateless property. In this paper, we present a secure Certificateless encryption (CLE) scheme with short ciphertext. The ciphertext length is at least |m|-bit (the length of a plaintext) shorter than the existing CLE schemes while retaining similar efficiency of computation. The new scheme is provably secure against adaptive chosen ciphertext attacks in the random oracle model.

关键词：证书密文加密安全随机预言模型公钥密码学密钥托管计算效率

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Reinforcing software quality measure by indirect coupling metrics

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Journal of Convergence information Technology 2011年第12期6卷 229-237页

作者： Chen, Jianguo Wang, Hui Qian, Xiaoyao Wang, Chao Bruda, Stefan D. College of Information Engineering China Jiliang University Hangzhou 310018 China Key Lab of Specialty Fiber Optics and Optical Access Network Shanghai University Shanghai 200072 China Department of Computer Science Bishop's University Sherbrooke J1M 1Z7 Canada

Internal metrics of the software artifact quality may allow the users to measure the quality of the intermediate deliverables and thereby predict the quality of the final product. Therefore corrective actions may be initiated as early as possible in the software development life cycle. This paper will discuss one of internal metrics, the coupling metric. Coupling metrics received increased recognition since it is widely agreed that there is an empirical relationships between coupling metrics and vulnerabilities. Therefore coupling metrics are indicators of important quality attributes of software systems. Though many literatures have studied coupling metrics, some limitations of acquiring coupling metrics still exist, e.g., the direct-only coupling (DOC) and indirect coupling with the highest transitive metric (ICHTM). We argue that indirect coupling will reinforce the quality measure based on the direct-only coupling. We also believe that the different weights should be applied to the direct and indirect couplings in order to get the final coupling metric for each entity in the software system. This paper illustrates how our new coupling metric is superior to DOC or ICHTM by a case study. Some advantages of our coupling metrics such as coupling in three levels are also investigated.

关键词： Software design

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Research on structured storage and index of data flow in disaster tolerance system

Research on structured storage and index of data flow in dis...

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2010 International Conference on computer, Mechatronics, Control and Electronic Engineering, CMCE 2010

作者： Hou, Fangyuan Li, Dong Yu, Xiangzhan Computer Network and Information Security Lab. Harbin Institute of Technology Harbin China

ISBN: (纸本)9781424479566

Based on the problem that the storage of data flow lacks structure and the data retrieval speed is slow in some disaster tolerance systems, a structured data storage and high efficient data retrieval model is proposed in this paper. In this model, the circular queue structure is used in the dynamic shared memory buffer pool, which has improved the storage efficiency of real-time data flow;the circular queue data storage structure and an improved B+ tree index structure are used in the hard disk, which has solved the problem that how to store new data when the storage space is full, and improved the data retrieval efficiency in some degree. Test results show that this model has better data storage capacity and faster data retrieval speed. © 2010 IEEE.

关键词： Data transfer

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Video steganography using motion vector and linear block codes

Video steganography using motion vector and linear block cod...

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2010 IEEE International Conference on Software Engineering and Service Sciences, ICSESS 2010

作者： Pan, Feng Xiang, Li Yang, Xiao-Yuan Guo, Yao Key Laboratory of Network and Information Security of APF Engineering College of the Armed Police Force Xi'an China Key Laboratory of Computer Network and Information Security of the Ministry of Education Xidian University Xi'an China

ISBN: (纸本)9781424460526

A novel video steganography scheme based on motion vectors and linear block codes has been proposed in this paper. Our method embed secret messages in the motion vectors of cover media during the process of H.264 compressing. Linear block codes has been used to reducing the modification rate of the motion vectors. The proposed steganographic scheme is not only has lowly computational complexity, but also has highly imperceptible to human being. Furthermore, the secret information can be extracted directly without using the original video sequences. Experiments are designed to prove the feasibility of the proposed method. Experimental results show that our proposed scheme can embed large amounts of information and can maintain good video quality as well. © 2010 IEEE.

关键词： Steganography

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A comprehensive model to assess e-commerce security based on ahp and evidential reasoning: First results

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ICIC Express Letters, Part B: Applications 2011年第1期2卷 19-24页

作者： Zhang, Yajuan Deng, Xinyang Jiang, Wen Deng, Yong School of Computer and Information Sciences Southwest University No. 2 Tiansheng Road Beibei District Chongqing 400715 China Hangzhou Key Lab of E-Business and Information Security Hangzhou Normal University No. 16 Xuelin Street Hanzhou 310036 China School of Electronics and Information Technology Northwestern Polytechnical University No. 127 Youyixi Road Xi'an 710072 China School of Electronics and Information Technology Shanghai Jiao Tong University No. 800 Dongchuan Road Shanghai 200240 China

E-Commerce security has become one of the most important issues in the development of E-Commerce. In this paper, a new model is proposed to facilitate the assessment of E-Commerce security. In our model, both AHP method and the theory of evidence are combined together. AHP method is used to calculate the weights of each issue associated with E-Commerce security. Then, evidential reasoning is integrated to combine all the issues, regarded as evidences, in order to derive a consensus decision for the degree of E-Commerce security. The first results of a numerical example are presented to illustrate the efficiency of our model in the assessment of E-Commerce security. © 2011 ISSN 2185-2766.

关键词： Electronic commerce

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Full rate and full diversity STBC in decode-and-forward relay systems

Full rate and full diversity STBC in decode-and-forward rela...

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2010 International Conference on Communications and Intelligence information security, ICCIIS 2010

作者： Wang, Yong Li, Hui Ministry of Education Key Lab. of Computer Network and Information Security School of Telecommunications Engineering Xidian University Xi'an China

ISBN: (纸本)9780769542607

Diversity techniques are very effective tools to increase signal reception quality in Rayleigh fading channels. A novel space-time block coding method for cooperative relay networks is proposed which guarantees full diversity for any number of mobile relays with minimal delay, provided that few bits of feedback from the destination to the source and the relays are available. As in the case of orthogonal space-time block codes, all transmitted symbols are separately decoded both in the relays and the destination. Therefore, decoding complexity is linear. In our proposed scheme, larger number of codes can be generated for improved coding gain. The performance of the proposed scheme is investigated for cooperative communication. It is shown that the new approach provides SNR improvement, and it is more resilient to feedback errors compared to the antenna selection technique on the basis of same number of feedback bits. © 2010 IEEE.

关键词： Cooperative communication

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An efficient automated trust negotiation framework supporting adaptive policies

An efficient automated trust negotiation framework supportin...

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2nd International Workshop on Education Technology and computer Science, ETCS 2010

作者： Liu, Bailing Lu, Hongwei Zhao, Yizhu College of Computer Science and Technology Huazhong University of Science and Technology Wuhan China Key Lab of Information Network Security Ministry of Public Security Shanghai China

ISBN: (纸本)9780769539874

Automated trust negotiation (ATN) is an approach that establishes mutual trust between strangers wishing to share resources or conduct business by gradually requesting and disclosing digitally signed credentials. Previous work on improving negotiation efficiency mainly focuses on using history negotiation information, which may leak much unnecessary information and cannot improve the negotiation efficiency if both negotiators do not have appropriate history information. Thus in this paper, we enhance the negotiation efficiency from a new aspect adaptive policies. An ATN framework is designed to enhance the negotiation efficiency, which can not only simplify the negotiation process and reduce the number of exchanged credentials and credential validations whenever possible, but also avoid to revealing unnecessary information during negotiations. This framework presents a number of innovative features, such as the support for overlapping virtual organizations (VOs for short) to evaluate trustworthiness level, and the use of fine-grained adaptive policies to adjust policies based on the trustworthiness levels. © 2010 IEEE.

关键词： Efficiency

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A key-chain based key management scheme for heterogeneous sensor network

A key-chain based key management scheme for heterogeneous se...

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2010 IEEE International Conference on information Theory and information security, ICITIS 2010

作者： Ou, Guohua Huang, Jie Li, Juan Key Lab. of Information Network Security Ministry of Public Security China School of Information Science and Engineering Southeast University China

ISBN: (纸本)9781424469406

key management poses a main concern for security operation in wireless sensor networks. Most existing key management schemes try to establish shared keys for all pairs of neighbor sensors in homogeneous sensor networks. In recent, some research has demonstrated that heterogeneous sensor networks can achieve better performance in security than homogeneous networks. In this paper we propose a key- chain based key management scheme for heterogeneous sensor networks. The proposed scheme handles various events, such as pair-wise key establishment, cluster key distribution and renovation. Through the analysis of both security and performance, we show that the scheme reduces the node storage requirements, supports dynamic sensor networks, and also achieves better security than that of the existing sensor key management schemes. © 2010 IEEE.

关键词： Sensor nodes

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