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Conjugate adjoining problem in braid groups and new design of braid-based signatures

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Science china(Information Sciences) 2010年第3期53卷 524-536页

作者： WANG LiCheng1,2, WANG LiHua2, CAO ZhenFu3, YANG YiXian1 & NIU XinXin1 Information Security Center, state key laboratory of networking and switching technology, beijing university of posts and telecommunications, beijing 100876, china 2National Institute of Information and communications technology, Tokyo 184-8795, Japan 3Trusted Digital technology laboratory, Shanghai Jiao Tong university, Shanghai 200240, china Information Security Center State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing China National Institute of Information and communications technology Tokyo Japan Trusted Digital technology laboratory Shanghai Jiao Tong University Shanghai China

The development of quantum computation casts serious threats to the securities of most existing public-key cryptosystems. Braid-based cryptography is one of the alternatives that have potential advantages in resisting quantum attacks. In this paper, the state of the art of braid cryptography is surveyed, and then a new cryptographic problem-conjugate adjoining problem related to braid groups is proposed. Based on this problem, we design a new braid-based signature scheme. This scheme is efficient and provably secure in the random oracle model. Further, we present the comparison between braid-based signatures and RSA-based ones. The signing process of the braid-based schemes is more efficient than that of RSA-based ones, while the verifying process of the braid-based ones is observably slow. Hence, braid-based signatures are suitable for scenarios where the signing process has to be as quick as possible but delays are permitted in the verifying process, for example, in off-line e-cash systems. The key sizes in braid-based schemes are considerably large-about 2K bits in the case of secret keys and 12K bits in the case of public keys. However, braid operations are much simpler and more efficient than modular exponential operations. Therefore, braid-based schemes can be embedded into devices with low computational ability and large memory space. The capability of braid cryptosystems to resist currently known quantum attacks is also discussed from the perspective of hidden subgroup problems.

关键词： braid group conjugate adjoining problem digital signature provable security resistance to quantum attack

Secure Beamforming Design for SWIPT in Cooperative D2D communications

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china communications 2017年第1期14卷 20-33页

作者： Li Jiang Cheng Qin Xixi Zhang Hui Tian state key laboratory of networking and switching technology Beijing University of Posts and Telecommunicationsand Science and Technology on Information Transmission and Dissemination in Communication Networks LaboratoryBeijing100876China

In device-to-device(D2D) communications, device terminal relaying makes it possible for devices in a network to function as transmission relays for each other to enhance the spectral efficiency. In this paper we consider a cooperative D2D communication system with simultaneous wireless information and power transfer(SWIPT). The cooperative D2D communication scheme allows two nearby devices to communicate with each other in the licensed cellular bandwidth by assigning D2D transmitters as half-duplex(HD) relay to assists cellular downlink transmissions. In particular, we focus on secure information transmission for the cellular users when the idle D2D users are the potential eavesdroppers. We aim to design secure beamforming schemes to maximize the D2D users data rate while guaranteeing the secrecy rate requirements of the cellular users and the minimum required amounts of power transferred to the idle D2D users. To solve this non-convex problem, a semi-definite programming relaxation(SDR) approach is adopted to obtain the optimal solution. Furthermore, we propose two suboptimal secure beamforming schemes with low computational complexity for providing secure communication and efficient energy transfer. Simulation results demonstrate the superiority of our proposed scheme.

关键词： device-to-device(D2D) communications half-duplex relaying physical layer security secure beamforming simultaneous wireless information and power transfer

A Method of IT Service Portfolio Selection Based on BDIM

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A Method of IT Service Portfolio Selection Based on BDIM

Construction of nonbinary quantum cyclic codes by using graph method

2011 3rd International Conference on Computer Research and Development(ICCRD 2011)

作者： Xu Wei state key laboratory of networking and switching beijing university of posts and telecommunications beijing china Zhan Zhiqiang state key laboratory of networking and switching beijing university of posts and telecommunications beijing china

This paper presents an approach to define the IT service portfolio so that the definition can bring the best interests to the IT Service provider and its *** the Service Strategy phase of the IT service life cycle defined in ITIL,the major challenge to be faced by IT executives is the selection of a maximum benefits IT service *** this paper,the IT service portfolios are mainly evaluated in two ways,which are the value that the customer can receive from it and the analysis of the potential financial impact from the SLA-dependent *** is uncertainty in the above estimate,which is taken into account by means of utility theory and interval *** outcome of the approach helps the service provider easily define the IT service portfolio.

关键词： Information technology Infrastructure Library (ITIL) IT service portfolio IT service management(ITSM) Business-driven IT Management(BDIM) Interval Arithmetic

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Science in china(Series F) 2005年第6期48卷 693-702页

作者： LIU Tailin1,2,3, WEN Qiaoyan1 & LIU Zihui4 1. School of Science, beijing university of posts and telecommunications, beijing 100876, china 2. state key laboratory of Integrated Services Network, Xidian university, Xi’an 710071,china 3. Shandong Finance Institute, Jinan 250014, china 4. School of Mathematical Sciences, Peking university, beijing 100871, china School of Science Beijing University of Posts and Telecommunications Beijing China state key laboratory of Integrated Services Network Xidian University Xi’an China Shandong Finance Institute Jinan China School of Mathematical Sciences Peking University Beijing China

Using the graph method proposed by Schlingemann and Werner, this paper introduces a technique to construct nonbinary quantum cyclic codes and provides a specific example. We also construct the quantum codes [[8, 2, 4]... 详细信息

关键词： nonbinary quantum stabilizer codes quantum cyclic codes

Influence of magnetic current on the ground state entanglement in an isotropic transverse XY chain

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Progress in Natural Science:Materials International 2007年第10期17卷 1147-1151页

作者： Liu Dan1,2 , Zhang Yong3 and Long Guilu1,2(1. key laboratory for Atomic and Molecular NanoSciences, and Department of Physics, Tsinghua university, beijing 100084, china 2. Center of Quantum Information Science and technology, Tsinghua National laboratory for information Science and technology, beijing 100084, china 3. Institute of Physics, School of Sciences, beijing university of posts and telecommunications, beijing 100876, china) key laboratory for Atomic and Molecular NanoSciences Department of Physics Tsinghua University Beijing 100084 China Center of Quantum Information Science and technology Tsinghua National Laboratory for Information Science and Technology Beijing 100084 China Institute of Physics School of Sciences Beijing University of Posts and Telecommunications Beijing 100876 China

We study the ground state entanglement in a three-qubit XY chain under the influence of a magnetization current. It is found that the ground state changes from a W state to a disentangled state as the magnetic field varies. When the Lagrange multiplier λ>3, namely under a strong magnetic current, the ground state holds onto a W state for a large range of the magnetic field strength. A phase transition to the magnetization-current phase occurs under a certain condition.

关键词： Heisenberg-XY chain magnetic-current phase transition.

PROTECTIVE CIRCUIT ROUTING ALGORITHM BASED ON MULTIPLE ANT COLONIES ALGORITHM

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PROTECTIVE CIRCUIT ROUTING ALGORITHM BASED ON MULTIPLE ANT C...

Integrated VP-Based Control Strategies for ATM Survivable Networks

2009 IEEE International Conference on Communication technology and Applications（ICCTA2009）

作者： Ao Xiong Yongping Zhang Luoming Meng state key laboratory of networking and switching technology beijing university of posts and telecommunications beijing 100876 china

＜正＞Route protection for key circuits is the important method to improve the quality of service in transmission *** on analyzing the principle of protective circuit routing,this paper presents that single ant colony algorithm can not be used to select protective ***,this paper presents an algorithm using multiple ant colonies algorithm to solve the *** different routing algorithms-selecting protective circuit for using circuit and selecting both protective and protected circuit are all described in ***,the validity of the algorithm is verified with an example.

关键词： multiple ant colonies system protective routing algorism transmission network

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The Journal of china Universities of posts and telecommunications 1996年第2期3卷 14-21页

作者： Chen Shanzhi Cheng Shiduan and Chen Junliang(state key laboratory of switching technology and telecommunication Networksbeijing university of posts and telecommunications, beijing 100088, P. R. china) state key laboratory of switching technology and telecommunication Networks beijing university of posts and telecommunications Beijing 100088 P. R. China hs.ulaval.ca

Nowadays the self-healing techniques in ATM networks are highly considered. However, in mostof networks, the normal control and sell-healing control are separately considered. In this paper, intenttedATM VP-based control strategies for ATM survivable networks are prOPosed, which combine the normalcontrol and self-healing control in a unified wad, being able to operate under both normal conditions andcatastrophic failure situations. These strategies allow a cost-effective network plan and design.

关键词： s: integrated VP-based control strategy ATM survivable network normal control self-healing

A REVOCATION SCHEME FOR THE CLOUD COMPUTING ENVIRONMENT

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A REVOCATION SCHEME FOR THE CLOUD COMPUTING ENVIRONMENT

A New Backup-VP Priority Restoration Methodfor ATM Survival Networks

2011 IEEE International Conference on Cloud Computing and Intelligence Systems(CCIS2011)

作者： Xiaobiao Li,Qiaoyan Wen state key laboratory of networking and switching technology,beijing university of posts and telecommunications,beijing,china

In order to meet the authentication requirement of the revoking frequently and dynamic network environment,a revocation scheme for the cloud computing environment is *** entering,leaving,revoking and authentication of entities are implemented based on the public key cryptography and the secure dynamic one-way accumulator,and the cross-domain property is also *** results show that the proposed scheme is provable secure to realize the identity authentication,session key agreement and key update with entity secrecy and perfect forward secrecy *** the cloud computing environment,compared with the existing schemes,this solution has a higher level of security,better performance and more comprehensive problem solving for revocation.

关键词： cloud computing revocation authentication cross-domain

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The Journal of china Universities of posts and telecommunications 1995年第2期2卷 6-12页

作者： Chen Shanzhi Cheng Shiduan and Chen Junliang(state key laboratory of switching technology of switching technology and telecommunication Networksbeijing university of posts and telecommunications, beijing 100088, P. R. china)

In this paper, we propose a new backup-VP priority restoration method for ATM survival net-works. in order to improve the survivability performance of higher priority VPs in case of multi-failure under the minimum amout of spare capacity required. This method is a part of a hybrid restoration ,mechanism (to be presented later), which integrates a backup-VP, method￣[2] and a distributed flooding algorithm￣[3] in theATM layer. This method is a path restoration between VP terminal nodes, completes the restoration with bi-directional message transmission by ustng pre-assigned backup VP's in case of single failure, and improvesthe restoration time of higher priority VPs in case of multi-failure, but it should cooperate with anotherorganic part of the hybrid restoration mechanism-a floodting algorithm to restore the remaining lower priorityVPs. This method can use resource more efficiently and obtain a better cost-performance feature.

关键词： backup-VP restoration method priority restoration hybrid restoration mechanism,ATM survival neticorkts