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Quantum threshold group signature

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science china(Physics,Mechanics & Astronomy) 2008年第10期51卷 1505-1514页

作者： YANG YuGuang1,2,3 & WEN QiaoYan4 1 College of Computer science and technology, beijing University of technology, beijing 100124, china 2 State key laboratory of Integrated Services network, Xidian University, Xi’an 710071, china 3 State key laboratory of information Security (Graduate University of Chinese Academy of sciences), beijing 100049, china 4 State key laboratory of networking and Switching technology, beijing University of Posts and Tele-communications, beijing 100876, china College of Computer science and technology Beijing University of Technology Beijing 100124 China State key laboratory of Integrated Services network Xidian University Xi’an 710071 China State key laboratory of information Security Graduate University of Chinese Academy of Sciences Beijing 100049 China State key laboratory of networking and Switching technology Beijing University of Posts and Telecommunications Beijing 100876 China

In most situations, the signer is generally a single person. However, when the message is written on behalf of an organization, a valid message may require the approval or consent of several persons. Threshold signature is a solution to this problem. Generally speaking, as an authority which can be trusted by all members does not exist, a threshold signature scheme without a trusted party appears more attractive. Following some ideas of the classical Shamir’s threshold signature scheme, a quantum threshold group signature one is proposed. In the proposed scheme, only t or more of n persons in the group can generate the group signature and any t-1 or fewer ones cannot do that. In the verification phase, any t or more of n signature receivers can verify the message and any t-1 or fewer receivers cannot verify the validity of the signature.

关键词： threshold quantum signature trusted party quantum cryptography

Threshold quantum secret sharing between multi-party and multi-party

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science china(Physics,Mechanics & Astronomy) 2008年第9期51卷 1308-1315页

作者： YANG YuGuang1,2,3 & WEN QiaoYan4 1 College of Computer science and technology,beijing University of technology,beijing 100124,china 2 State key laboratory of Integrated Services network,Xidian University,Xi’an 710071,china 3 State key laboratory of information Security (Graduate University of Chinese Academy of sciences),beijing 100049,china 4 State key laboratory of networking and Switching technology,beijing University of Posts and Tele-communications,beijing 100876,china College of Computer science and technology Beijing University of Technology Beijing 100124 China State key laboratory of Integrated Services network Xidian University Xi’an 710071 China State key laboratory of information Security (Graduate University of Chinese Academy of sciences) Beijing 100049 China State key laboratory of networking and Switching technology Beijing University of Posts and Telecommunications Beijing 100876 China

A threshold quantum secret sharing (TQSS) scheme between multi-party and multi-party was proposed using a sequence of single photons,which is useful and efficient when the parties of communication are not all present. We described the process of this TQSS scheme and discussed its security. It was shown that entan-glement is not necessary for quantum secret sharing. Moreover,the theoretic effi-ciency was improved to approach 100% as almost all the instances can be used for generating the private key,and each photon can carry one bit of information. This protocol is feasible with the present-day technique.

关键词： threshold quantum secret sharing quantum cryptography single photon multi-party and multi-party

Threshold proxy quantum signature scheme with threshold shared verification

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science china(Physics,Mechanics & Astronomy) 2008年第8期51卷 1079-1088页

作者： YANG YuGuang1,3,4 & WEN QiaoYan2 1 College of Computer science and technology,beijing University of technology,beijing 100124,china 2 State key laboratory of networking and Switching technology,beijing University of Posts and Tele-communications,beijing 100876,china 3 State key laboratory of Integrated Services network,Xidian University,Xi’an 710071,china 4 State key laboratory of information Security(Graduate University of Chinese Academy of sciences) ,beijing 100049,china 1. College of Computer science and technology Beijing University of Technology Beijing 100124 China 3. State key laboratory of Integrated Services network Xidian University Xi’an 710071 China 4. State key laboratory of information Security (Graduate University of Chinese Academy of sciences) Beijing 100049 China 2. State key laboratory of networking and Switching technology Beijing University of Posts and Telecommunications Beijing 100876 China

A threshold proxy quantum signature scheme with threshold shared verification is proposed. An original signer could authorize a group as its proxy signers. Then only t or more of n persons in the proxy group can generate the proxy signature on behalf of the original signer and any t-1 or fewer ones cannot do that. When the proxy signature needs to be verified,any t or more of n persons belonging to the verification group can verify the message and any t-1 or fewer ones cannot verify the validity of the proxy signature.

关键词： quantum signature threshold proxy quantum group signature threshold shared verification

Multiparty simultaneous quantum identity authentication with secret sharing

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science china(Physics,Mechanics & Astronomy) 2008年第3期51卷 321-327页

作者： YANG YuGuang1,2,WEN QiaoYan3 & ZHANG Xing4,5 1 College of Computer science and technology,beijing University of technology,beijing 100022,china 2 State key laboratory of information Security (Graduate University of the Chinese Academy of sciences),beijing 100049,china 3 School of science,beijing University of Posts and Telecommunications,beijing 100876,china 4 Institute of Electronic technology,information Engineering University,Zhengzhou 450004,china 5 Trusted Computing laboratory,beijing University of technology,beijing 100022,china College of Computer science technology Beijing University of Technology Beijing 100022 China State key laboratory of information Security [Graduate University of the Chinese Academy of sciences] Beijing 100049 China School of science Beijing University of Posts Telecommunications Beijing 100876 China Institute of Electronic technology Information Engineering University Zhengzhou 450004 China Trusted Computing laboratory Beijing University of Technology Beijing 100022 China

Two multiparty simultaneous quantum identity authentication (MSQIA) protocols based on secret sharing are presented. All the users can be authenticated by a trusted third party (TTP) simultaneously. In the first protocol,the TTP shares a random key K with all the users using quantum secret sharing. The ith share acts as the authentication key of the ith user. When it is necessary to perform MSQIA,the TTP generates a random number R secretly and sends a sequence of single photons encoded with K and R to all the users. According to his share,each user performs the corresponding unitary operations on the single photon sequence sequentially. At last,the TTP can judge whether the impersonator exists. The sec-ond protocol is a modified version with a circular structure. The two protocols can be efficiently used for MSQIA in a network. They are feasible with current technol-ogy.

关键词： quantum identity authentication secret sharing quantum cryptography

Fuzzy dynamic characteristic model based attitude control of hypersonic vehicle in gliding phase

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science china(information sciences) 2011年第3期54卷 448-459页

作者： LUO Xiong 1,2 & LI Jiang 1 1 Department of Computer science and technology, key laboratory of advanced Control of Iron and Steel Process (Ministry of Education), University of science and technology beijing, beijing 100083, china 2 National laboratory of Space Intelligent Control, beijing 100190, china 1. Department of Computer science and technology Key Laboratory of Advanced Control of Iron and Steel Process (Ministry of Education) University of Science and Technology Beijing Beijing 100083 China2. National Laboratory of Space Intelligent Control Beijing 100190 China

The intelligent autonomous control of hypersonic vehicles has aroused great interest from the field of spacecraft. To solve the problem of longitudinal attitude control of hypersonic vehicle in gliding phase, a new intelligent controller is proposed in this paper. This new controller is based on the fuzzy dynamic characteristic modeling method. The fuzzy logic is introduced into the characteristic modeling by dividing the whole restriction range into several subspaces. Simulations show that this modification greatly improves the performance of the original method. With the same whole restriction range the fuzzy dynamic characteristic modeling decreases the time of convergence, and at the same time makes the attitude angle tracing more precise and robust. Since the sub-model is a characteristic model that has stronger adaptiveness than a fixed local model, the number of fuzzy rules is greatly reduced. Our model sharply reduces the complexity in constructing a fuzzy dynamic model. Finally, simulation results are given to show the effectiveness of the proposed approach in dealing with the attitude control problem of hypersonic vehicle in gliding phase.

关键词： hypersonic vehicle gliding attitude control fuzzy dynamic characteristic modeling

Secure network coding in the presence of eavesdroppers

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science china(information sciences) 2010年第3期53卷 648-658页

作者： LUO MingXing1,2,3, YANG YiXian1,2,3, WANG LiCheng1,2,3 & NIU XinXin1,2,3 1information Security Center, State key laboratory of networking and Switching technology, beijing University of Posts and Telecommunications, beijing 100876, china 2key laboratory of network and information Attack and Defence technology of MOE, beijing University of Posts and Telecommunications, beijing 100876, china 3National Engineering laboratory for Disaster Backup and Recovery, beijing University of Posts and Telecommunications, beijing 100876, china 1. information Security Center State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China2. Key Laboratory of Network and Information Attack and Defence Technology of MOE Beijing University of Posts and Telecommunications Beijing 100876 China3. National Engineering Laboratory for Disaster Backup and Recovery Beijing University of Posts and Telecommunications Beijing 100876 China

Our concern, in the paper, is to construct information-theoretic secure network coding in the presence of eavesdroppers. Based on the generalized attack model and all-or-nothing transformation, the security of network coding in the generalized combination network can be characterized by the network capacity and the min-cut bound of wiretapping set from the source. Furthermore, it can be extended to any directed acyclic networks with single source. Compared with the traditional results, we construct information-theoretic secure network coding without additional encryptions and giving up any capacity.

关键词： all-or-nothing transformation secure network coding eavesdropping

Data-aided synchronization algorithm dispensing with searching procedures for UWB communications

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science china(information sciences) 2012年第4期55卷 778-788页

作者： REN ZhiYuan 1,JIANG Ting1,ZHONG Yi 2 & ZHAO ChengLin 1 1 key laboratory of Universal Wireless Communications,Ministry of Education of china Wireless network laboratory,beijing University of Posts and Telecommunications,beijing 100876,china 2 School of information Engineering,North china University of technology,beijing 100041,china 1. key laboratory of Universal Wireless Communications Ministry of Education of China Wireless network laboratory Beijing University of Posts and Telecommunications Beijing 100876 China2. School of Information Engineering North China University of Technology Beijing 100041 China

Rapid and accurate synchronization constitutes a major challenge in deploying Ultra-Wideband impulse radio (UWB-IR) for indoor wireless *** paper develops a data-aided (DA) synchro-nization algorithm dispensing with searching procedures for UWB-IR *** adopting a stream of alternating orthogonal pulses,frame-level synchronization can be achieved without channel ***-out utilizing any searching procedure,the timing offset estimator is obtained in a closed *** exhaustive search can be avoided,both computational complexity and synchronization time are *** and comparisons are provided to illustrate the advantages of our design over the alternatives.

关键词： Ultra-Wideband impulse radio synchronization dispensing with searching procedures searching space data-aided estimation

Analysis of coupling from core mode to counter-propagating radiation modes in tilted fiber Bragg gratings

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science china(information sciences) 2010年第5期53卷 1078-1088页

作者： LU ShaoHua 1,2 , XU Ou 1,2 , FENG SuChun 1,2 , DONG XiaoWei 1,2 , PEI Li 1,2 & JIAN ShuiSheng 1,2 1 key laboratory of All Optical network & advanced Telecommunication network of EMC, beijing Jiaotong University, beijing 1.0044, china 2 Institute of Lightwave technology, beijing Jiaotong University, beijing 1.0044, china 1. key laboratory of All Optical network & advanced Telecommunication network of EMC Beijing Jiaotong University Beijing 100044 China2. Institute of Lightwave Technology Beijing Jiaotong University Beijing 100044 China

Radiation-mode coupling is stronger and more efficient in tilted fiber Bragg gratings than in other fiber gratings; it has good advantage in such fields as optical communication and optical sensors. A simplified coupled-mode theory (CMT) approach is proposed for what we believe to be the first time, whose validity is demonstrated by comparing its simulation results with that of the complete CMT equations. With the simplified CMT approach, a theoretical spectral analysis of coupling from core mode to counter-propagating radiation modes in reflective tilted fiber Bragg gratings is presented. The influence of grating length, refractive index modulation amplitude and tilt angle is exhaustively investigated on the transmission spectrum characteristics. The different dependences between s-polarized and p-polarized radiation-mode coupling on grating tilt angle are discussed, and the coupling strength of 45 -tilted gratings shows the greatest polarization dependence with the limitation of backward-propagating radiation-mode coupling.

关键词： fiber optics tilted fiber Bragg gratings coupled-mode theory radiation-mode coupling

Theoretical research progress in new-generation Internet architecture

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science in china(Series F) 2008年第11期51卷 1634-1660页

作者： WU JianPing1,2,3,LIU Ying2,3 & WU Qian2,3 1 Department of Computer science,Tsinghua University,beijing 100084,china 2 network Research Center,Tsinghua University,beijing 100084,china 3 Tsinghua National laboratory for information science and technology(TNList) ,beijing 100084,china 1. Department of Computer science Tsinghua University Beijing 100084 China 2. network Research Center Tsinghua University Beijing 100084 China 3. Tsinghua National laboratory for information science and technology (TNList) Beijing 100084 China

Internet has become the most important information infrastructure supporting modern socio-economic development, social progress and technological Innovation. Invented 30 years ago, today Internet is facing increasingly severe technical challenges. This paper introduces the progress of the major international newgeneration Internet research plans; analyzes its basic characteristics and the principal contradictions during the development; detsiledly introduces the research carried out by 973 Project ＂Research of Future Internet Architecture＂ on the key scientific issues of new-generation Internet architecture and its latest research results; and looks to the future of the research-focus faced with the new situations of the basic research of new-generation Internet architecture as well as the new demands of innovative applications on Internet architecture.

关键词： new-generation Internet network architecture multi-dimension scalability