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Koblitz Elliptic Curves Generating Based on Evolutionary Cryptography Theory and Verifying Parameters Recommended by NIST

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China Communications 2011年第4期8卷 41-49页

作者：王潮张焕国刘礼黎 Key Lab of Specialty Fiber Optics and Optical Access Network Ministry of Education Shanghai University Key Laboratory of Aerospace Information Security and Trusted Computing Ministry of Education Computer School Wuhan University Huawei Technologies Co. Ltd

Elliptic curve cryptography is one of the most important public-key *** Koblitz Curve is a special kind of elliptic curve in ECC and its security mainly depends on the base *** on Evolutionary Cryptography theory,which becomes a principal concept for cryptography design and cryptanalysis,we propose a new algorithm for secure EC generation based on Ant Colony Optimization(ACO)to accelerate the search process of safe base *** preliminarily deal with secure Koblitz curve selecting over the field F(2800).Experiments show that the base field and base point of secure curves generated by ant colony algorithm have gone beyond the parameter range of Koblitz curves recommended by *** can present many new secure Koblitz curves,including base field and base point,which are not recommended by *** maximum size of our secure Koblitz curve has gone beyond *** algorithm in this paper follows the same cryptography criteria recommended by the ***,it can resist current *** analysis and experimental results prove that the new algorithm is effective and successful,and it is the first successful practice of Evolutionary Cryptography theory in public cryptography research.

关键词： evolutionary cryptography ECC secure curves ACO

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Chosen ciphertext secure broadcast encryption in the standard model

Chosen ciphertext secure broadcast encryption in the standar...

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International Conference on Electric information and Control Engineering

作者： Sun, Jin Hu, Yu-Pu Department of Application Mathematics Xi'An University of Technology Xi'an China Key Lab of Computer Network and Information Security Xidian University Xi'an China

ISBN: (纸本)9781424480395

In Eurocrypt'2005, Waters' identity-based encryption scheme suffers a drawback that the scheme only guarantees chosen plaintext security but chosen ciphertext security, and to give concurrent consideration both the efficiency and intract-ability problem in the broadcast encryption, a new identity-based broadcast encryption of chosen ciphertext secure is proposed. The new scheme was regarded as the extended version of Waters' scheme and is based on the standard model. By adding an additional information in ciphertext, the adaptive selective-ID security and the chosen ciphertext security are gained simultaneously in the scheme. The scheme's security is reduced to the decisional bilinear Diffie-Hellman intractability assumption, so the security level is improved and it is suitable for high security environment. © 2011 IEEE.

关键词： security of data

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The availability of fast-flux service networks

The availability of fast-flux service networks

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International Conference on Selected Topics in Mobile and Wireless networking (iCOST)

作者： Yunfeng Xu Yansheng Lu Zhengbiao Guo Hubei Province Public Security Bureau To Defend The Corps Cyber Security Key Lab of Information NetWork Security Ministry of Public Security China School of Computer Science and Technology Hua Zhong University of Science and Technology Wuhan China

ISBN: (纸本)9781457720031

Fast-flux service network (FFSN) is consisted of a large scale of computers which have two main functions. Firstly, by providing a pool of huge number of IP addresses, the controller of FFSN can choose the IPs to provide services for their own domain name. Secondly, these computers can be served as agents to hide mother-ship. The character of FFSN is that the DNS records of domain name changes constantly at a high frequency. In this paper, we analyze the issue on the reliability of FFSN. The issue is resulted from the uncontrollable nodes of FFSN. We establish a model to describe the reliability by the theory of Poisson Process, and analyze the relationship between the reliability of FFSN and its size.

关键词： Availability Servers security IP networks computers Internet

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Multi-user private keyword search for cloud computing

Multi-user private keyword search for cloud computing

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2011 3rd IEEE International Conference on Cloud Computing Technology and Science, CloudCom 2011

作者： Yang, Yanjiang Lu, Haibing Weng, Jian Institute for Infocomm Research Singapore Singapore Dept. of Operations Management and Information Systems Leavey School of Business Santa Clara University United States Department of Computer Science Emergency Technology Research Center of Risk Evaluation and Prewarning on Public Network Security Jinan University Guangzhou China State Key Laboratory of Information Security Institute of Software Chinese Academy of Sciences China State Key Lab. of Networking and Switching Technology Beijing University of Posts and Telecommunications China

ISBN: (纸本)9780769546223

Enterprises outsourcing their databases to the cloud and authorizing multiple users for access represents a typical use scenario of cloud storage services. In such a case of database outsourcing, data encryption is a good approach enabling the data owner to retain its control over the outsourced data. Searchable encryption is a cryptographic primitive allowing for private keyword based search over the encrypted database. The above setting of enterprise outsourcing database to the cloud requires multi-user searchable encryption, whereas virtually all of the existing schemes consider the single-user setting. To bridge this gap, we are motivated to propose a practical multi-user searchable encryption scheme, which has a number of advantages over the known approaches. The associated model and security requirements are also formulated. We further discuss to extend our scheme in several ways so as to achieve different search capabilities. © 2011 IEEE.

关键词： Outsourcing

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Comments on a threshold authenticated encryption scheme

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International Journal of computers and Applications 2011年第2期33卷 132-136页

作者： Tan, Zuowen Department of Computer Science and Technology School of Information Technology Jiangxi University of Finance and Economics Nanchang 330032 Jiangxi Province China Key Lab. of Network Security and Cryptology School of Mathematics and Computer Science Fujian Normal University Fuzhou 350007 China

An authenticated encryption scheme (AE scheme) allows the signer to generate a valid authenticated ciphertext on a message such that the designated recipient can recover the message. AE schemes can achieve confidentiality and authenticity when message is transmitted over an insecure channel. The previous AE scheme only can allow one signer to generate the authenticated ciphertext. Recently, Chung et al. proposed a (t, n) threshold authenticated encryption scheme (TAE scheme) in which any t or more signers cooperate to produce a signature for a message and no one except the designated verifier can obtain the message from the ciphertext and verify the authenticity and integrity of the message. The scheme is based on elliptic curve cryptosystem. Moreover, the scheme applies a division-of-labour signature technique to reduce the load of every signer. In other words, every signer only needs to sign a message block assigned to it. Therefore, the (t, n) TAE scheme is more efficient than other AE schemes. However, some flaws of the scheme are found in this paper. Several security defects of the scheme are elaborated: (i) It suffers from conspiracy attack. (ii) It does not hold robustness. (iii) It is insecure against insider attacks. In addition, there exist some design defects in the TAE scheme. Some measures to remove these weaknesses are given in this paper.

关键词： Authentication

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Unicode-proof Code Injection Attack on Windows CE- A Novel Approach of Evading Intrusion Detection System for Mobile network

Unicode-proof Code Injection Attack on Windows CE- A Novel A...

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2011 IEEE 3rd International Conference on Communication Software and networks(2011第三届通信软件与网络国际会议 ICCSN2011)

作者： Yang Song Yuqing Zhang Yingfei Sun JingBo Yan National Computer Network Intrusion Protection Center Graduate University of Chinese Academy of Scie School of Information Science and Engineering Graduate University of Chinese Academy of Sciences Bei Key Lab of Computer Networks and Information Security of Ministry of Education Xidian University Xia

Code injection attack is a major way of spreading malware on network. The key section of code injection attack is a small piece of code, called shellcode, which performs unauthorized operations when it is injected into software as part of valid data. On Windows CE, input data are often encoded using Unicode before being processed. In such cases, shellcode should be built in a way that bypasses such encoding;that is, it should be Unicode-proof. Unicode-proof shellcode also has great advantage of evading instruction detection system. However, it is quite difficult to build Unicode-proof shellcode for the ARM architecture,.on which most embedded devices are developed, because the subset of instructions that can be used to write Unicode-proof shellcode is very limited. Moreover, the instruction cache in the ARM processor restricts the application of selfmodifying code, which is frequently used in shellcode writing. This novel research proposes an approach to *** Unicode-proof shellcode on Windows CE under these constraints. The approach applies to all versions of ARM processors and Windows CE, including systems evolved from Windows CE, such as Windows Mobile and Windows Phone. The shellcode is tested on three currently available devices.

关键词： Unicode-proof code injection Windows CE

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Improvement on a password authentication scheme for multi-server environments

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Journal of Convergence information Technology 2011年第1期6卷 218-228页

作者： Tan, Zuowen School of Information Technology Jiangxi University of Finance and Economics Nanchang 330032 Jiangxi Province China Key Lab of Network Security and Cryptology School of Mathematics and Computer Science Fujian Normal University Fuzhou 350007 Fujian Province China

Since each user needs to have different passwords with different remote servers in the multi-server environment, it is impossible to apply the authentication methods in a single server environment to the multi-server environment. Recently, Ren-Chiun Wang, Wen-Shenq Juang, and Chin-Laung Lei proposed an ID based remote user authentication scheme for multi-server environments. However, we demonstrate that their ID based authentication scheme lacks the authenticity of the Registration Center to the server. Moreover, their ID based authentication scheme does not satisfy perfect forward security. In this paper, an improved multi-server password based smart card authentication scheme is proposed. Our scheme can remove their security flaws. Compared with the previous password based smart card authentication schemes for the multi-server environments, our proposed scheme can hold more security advantages.

关键词： Authentication

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Cryptanalysis of two ID based password authentication schemes for multi-server environments

International Journal of Digital Content Technology and its ...

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International Journal of Digital Content Technology and its Applications 2011年第1期5卷 87-94页

Recently, Hsiang and Shih proposed a secure dynamic ID based remote user authentication scheme for multi-server environment. In this paper, we show that Hsiang and Shih's scheme is still vulnerable to off-line password guessing attacks, impersonation attacks and server spoofing attacks. And it cannot resist against extracting secret data by intercepting the authentication message. Chen, Huang and Chou proposed an improvement on Hsiang and Shih's scheme. However, we demonstrate that Chen, Huang and Chou's improved scheme suffers from impersonation attacks, password guessing attacks and server spoofing attacks. In addition, Chen et al.'s scheme cannot provide perfect forward security.

关键词： Authentication

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A delay guaranteed and services differentiated MAC protocol based on location and reservation in near-space

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Journal of Convergence information Technology 2011年第2期6卷 120-130页

作者： Chen, Chen Gao, Xinbo Pei, Qingqi National Key Lab. of Integrated Service Networks Xidian Univ Xi'an 710071 China School of Electronic Engineering Xidian Univ Xi'an 710071 China Ministry of Edu. Key Lab. of Computer Network and Information Security Xidian Univ Xi'an 710071 China

With an ever-increasing interests and demands in Near-Space, more and more researchers have put their attentions on this field, leading to an emerging needs for modeling the 20-100km altitude space especially for broadband communications. Among the lots of works, Media Access Control (MAC) undoubtedly has chief importance and urgency with which communicating objects or nodes can effectively access to Near-Space. However, previous MAC designs mainly focus their attentions on service differentiation by application purposes without considering nodal mobility. In fact, access control for nodes with different mobility levels has significantly influences to MAC performance and is complex and difficult to be implemented together with present MAC protocols. In this paper, we first presented a location method for Near-Space vehicles such as airships and unmanned planes and then modeled the mobile networks infrastructure with mobility considered. For determining the vehicles joining/leaving events locally, we quantify the communication range with Received Signal Strength Indicator (RSSI) aid. Then, for better managing the nodes access to the Near-Space with aforementioned works, we designed a TDMA based reservation MAC protocol to guarantee the servicedelay and networks coverage with best efforts. Simulation results showed that our proposed model better fit for Near-Space mobile communication environments and presented a lower delay and higher coverage regarding to different mobility levels.

关键词： Medium access control

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Cryptanalysis and Improvement of a Quantum Secret Sharing Protocol between Multiparty and Multiparty with Single Photons and Unitary Transformations

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Chinese Physics Letters 2010年第6期27卷 13-15页

作者： ZHU Zhen-Chao ZHANG Yu-Qing Key Lab of Computer Networks and Information Security of Ministry of Education Xidian University Xi'an 710071 National Computer Network Intrusion Protection Center Graduate University Chinese Academy of Sciences Beijing 100049

In a recent paper [Chin. Phys. Lett 25（2008）1187], a quantum secret sharing scheme between multiparty and multiparty was presented. We show that the protocol is not secure because the last member in Alice＇s group can illegally obtain most secret messages without introducing any error. Finally, a possible way to avoid the security flaw is suggested.

关键词： Secretion Cryptanalysis Improvement of a Quantum

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