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Revocable Hierarchical Identity-Based Broadcast Encryption

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Tsinghua Science and Technology 2018年第5期23卷 539-549页

作者： Dawei li Jianwei liu Zongyang Zhang Qianhong wu Weiran liu School of Electronic and information Engineering Beihang University Beijing 100191 China

Hierarchical Identity-Based Broadcast Encryption （HIBBE） organizes users into a tree-like structure, and it allows users to delegate their decryption ability to subordinates and enable encryption to any subset of users while only intended users can decrypt. However, current HIBBE schemes do not support efficient revocation of private keys. Here, a new primitive called Revocable Hierarchical Identity-Based Broadcast Encryption （RHIBBE） is formalized that allows revocation of the HIBBE. Ciphertext indistinguishability is defined against the selectively Bounded Revocable Identity-Vector-Set and Chosen-Plaintext Attack （IND-sBRIVS-CPA）. An IND-sBRIVS-CPA secure RHIBBE scheme is constructed with efficient revocation on prime-order bilinear groups. The unbounded version of the scheme is also shown to be secure but a little weaker than the former under the decisional n-Weak Bilinear Diffie-Hellman inversion assumption.

关键词： Revocable Hierarchical Identity-Based Broadcast Encryption (RHIBBE) revocation provable security

A large-area AgNW-modified textile with high-performance electromagnetic interference shielding

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npj Flexible Electronics 2020年第1期4卷 102-108页

作者： Junchen liu Sen lin Kai Huang Chao Jia Qingmin Wang Ziwei li Jianan Song Zhenglian liu Haiyang Wang Ming Lei hui wu state key laboratory of information Photonics and Optical Communications and School of Science Beijing University of Posts and Telecommunications100876 BeijingChina state key laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua University100084 BeijingChina

Manufacturing a flexible,light,large-area,and high-efficiency electromagnetic shielding materials in a straightforward and cost-effective manner presently remains a significant *** this work,we propose a conductive network design and verify its electromagnetic interference(EMI)shielding effectiveness(SE)by *** the structure and parameters obtained by simulation,we prepare a flexible EMI shielding material using silver nanowires(AgNWs)/polyvinyl butyral(PVB)ethanol solution and textile substructure via a facile immersing *** the frequency range of 5-18 GHz,the AgNWs/PVB textile with 1.4 mm thickness achieves an EMI SE of 59 dB,which exceeds the requirements for commercial *** to the low density of 56 mg/cm^(3),specific shielding effectiveness(SSE)of this material reaches 1053 dB m^(3)/*** is found that the AgNWs/PVB textile is more resistant to washing with water and oxidation than AgNWs textile without a PVB *** a result,the conductivity of AgNWs/PVB textile exhibits no change after washing with water and varies slightly after being kept in hot *** find that a signal monitor is unable to detect a signal emitted by a mobile phone from a jacket lined with AgNWs/PVB ***/PVB textile with these properties can be mass-produced as high-efficiency EMI shielding material for commercial applications.

关键词： high shielding silver

Construction and Genetic Analysis of Murine Hepatitis Virus Strain A59 Nsp16 Temperature Sensitive Mutant and the Revertant Virus

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Virologica Sinica 2011年第1期26卷 19-29页

作者： Guo-hui Chang Bao-jun Luo Pin Lu Lei lin Xiao-yan wu Jing li Yi Hu Qing-yu Zhu state key laboratory of Pathogen and Biosecurity Beijing Institute of Microbiology and Epidemiology Beijing 100071 China Changchun Changsheng life sciences limited Changchun 130103 China

Coronaviruses (CoVs) are generally associated with respiratory and enteric infections and have long been recognized as important pathogens of livestock and companion animals. Mouse hepatitis virus (MHV) is a widely studied model system for Coronavirus replication and pathogenesis. In this study,we created a MHV-A59 temperature sensitive (ts) mutant wu"-ts18(cd) using the recombinant vaccinia reverse genetics system. Virus replication assay in 17C1-1 cells showed the plaque phenotype and replication characterization of constructed wu"-ts18(cd) were indistinguishable from the reported ts mutant wu"-ts18. Then we cultured the ts mutant wu"-ts18(cd) at non-permissive temperature 39.5°C,which "forced" the ts recombinant virus to use second-site mutation to revert from a ts to a non-ts phenotype. Sequence analysis showed most of the revertants had the same single amino acid mutation at Nsp16 position 43. The single amino acid mutation at Nsp16 position 76 or position 130 could also revert the ts mutant wu"-ts18 (cd) to non-ts phenotype,an additional independent mutation in Nsp13 position 115 played an important role on plaque size. The results provided us with genetic information on the functional determinants of Nsp16. This allowed us to build up a more reasonable model of CoVs replication-transcription complex.

关键词： Genetic analysis MHV-A59 Temperature-sensitive mutant Revertant Nonstructural proteins (Nsp)

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福建省4种蕨类植物新记录

亚热带植物科学 2024年第3期53卷 276-279页

作者：王慧田黎雪吴锦平卫然刘彬彬徐超李中阳金水虎浙江农林大学林业与生物技术学院浙江杭州311300 中国科学院植物研究所/植物多样性与特色经济作物全国重点实验室/系统与进化植物学国家重点实验室北京100093 国家植物园北京100093 中国科学院大学生命科学学院北京100049 福建梅花山国家级自然保护区管理局福建龙岩362300 赣南师范大学生命科学学院江西赣州341000

通过对福建省梅花山国家级自然保护区蕨类及石松类植物的全面野外调查,发现福建省蕨类植物1个新记录属——裂禾蕨属Tomophyllum(***.)Parris,及4个新记录种——裂禾蕨Tomophyllum donianum(Spreng.)Fraser-Jenk.&Parris、针毛鳞盖蕨Micr... 详细信息

通过对福建省梅花山国家级自然保护区蕨类及石松类植物的全面野外调查,发现福建省蕨类植物1个新记录属——裂禾蕨属Tomophyllum(***.)Parris,及4个新记录种——裂禾蕨Tomophyllum donianum(Spreng.)Fraser-Jenk.&Parris、针毛鳞盖蕨Microlepia trapeziformis(Roxb.)Kuhn、长叶巢蕨Asplenium phyllitidis ***、草叶耳蕨Polystichum herbaceum Ching&***。新记录属和新记录种的发现丰富了福建省的植物多样性,为该地区植物区系地理学研究提供了资料。

关键词：福建省梅花山蕨类新记录

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Self-powered solar-blind photodiodes based on EFG-grown(100)-dominant β-Ga_(2)O_(3) substrate

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chinese Physics B 2021年第1期30卷 483-486页

作者： Xu-Long Chu Zeng liu Yu-Song Zhi Yuan-Yuan liu Shao-hui Zhang Chao wu Ang Gao Pei-Gang li Dao-You Guo Zhen-Ping wu Wei-Hua Tang laboratory of information Functional Materials and Devices School of Science&State Key Laboratory of Information Photonics and Optical CommunicationsBeijing University of Posts and TelecommunicationsBeijing 100876China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China The Engineering Research Center for Semiconductor Integrated Technology Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China china Aerospace System Simulation Technology Co. Ltd.(Beijing)Beijing 100195China Division of Interdisciplinary and Comprehensive Research&Platform for Characterization and Test Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Center for Optoelectronics Materials and Devices&key laboratory of Optical Field Manipulation of Zhejiang Province Department of PhysicsZhejiang Sci-Tech UniversityHangzhou 310018China School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China College of Electronic and Optical Engineering&College of Microelectronics Nanjing University of Posts and TelecommunicationsNanjing 210046China National and Local Joint Engineering laboratory for RF Integration and Micro-Packing Technologies Nanjing University of Posts and TelecommunicationsNanjing 210046China

We report the edge-defined-film-fed(EFG)-grown β-Ga_(2)O_(3)-based Schottky *** device has a reverse leakage current of ~nA and a rectified ratio of ~10^(4) at ±5 *** addition,the photodiode detector shows a dark current of 0.3 pA,a photo-responsivity(R) of 2.875 mA/W,a special detectivity(D*) of 10^(10) Jones,and an external quantum efficiency(EQE) of 1.4% at zero bias,illustrating a self-powered *** work may advance the development of the Ga_(2)O_(3)-based Schottky diode solar-blind photodetectors.

关键词： β-Ga_(2)O_(3)substrate Schottky photodiode solar-blind detection

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分布式光纤传感技术研究和应用的现状及未来

光学学报 2024年第1期44卷 3-65页

作者：张旭苹张益昕王亮余贶琭刘波尹国路刘琨李璇李世念丁传奇汤玉泉尚盈王奕首王晨王峰樊昕昱孙琪真谢尚然吴慧娟吴昊王花平赵志勇南京大学智能光感知与调控技术教育部重点实验室江苏南京210023 华中科技大学光学与电子信息学院湖北武汉430074 北京交通大学信息科学研究所北京100044 之江实验室光纤传感研究中心浙江杭州311100 重庆大学光电技术及系统教育部重点实验室重庆400044 天津大学精密仪器与光电子工程学院天津300072 中国电力科学研究院有限公司北京100192 中国煤炭地质总局勘查研究总院北京100039 中油奥博(成都)科技有限公司四川成都611731 中国科学院合肥物质科学研究院安徽光学精密机械研究所光子器件与材料安徽省重点实验室安徽合肥230031 齐鲁工业大学(山东省科学院) 山东省科学院激光研究所山东济南250104 厦门大学航空航天学院福建厦门361005 上海交通大学电子信息与电气工程学院区域光纤通信网与新型光通信系统国家重点实验室上海200240 北京理工大学光电学院信息光子技术工信部重点实验室北京100081 电子科技大学光纤传感与通信教育部重点实验室四川成都611731 兰州大学土木工程与力学学院甘肃兰州730000

我国大型基础设施的建设规模已多年位居世界之首,分布式光纤传感技术(DOFS)作为大型基础设施健康状态实时监测最有潜力的技术,近年来得到了迅速发展。针对DOFS在技术和应用的突破上面临的挑战,在介绍DOFS各技术基本工作原理、发展历史... 详细信息

我国大型基础设施的建设规模已多年位居世界之首,分布式光纤传感技术(DOFS)作为大型基础设施健康状态实时监测最有潜力的技术,近年来得到了迅速发展。针对DOFS在技术和应用的突破上面临的挑战,在介绍DOFS各技术基本工作原理、发展历史、现状以及典型应用原理和方案等的基础上,对其工作新机理、系统设计方案、研究发展方向等进行了阐述和讨论。

关键词：光纤光学分布式光纤传感技术光时域反射仪光频域反射仪干涉型分布式光纤传感

End-to-end encrypted network traffic classification method based on deep learning

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The Journal of china Universities of Posts and Telecommunications 2020年第3期27卷 21-30页

作者： Tian Shiming Gong Feixiang Mo Shuang li Meng wu Wenrui Xiao Ding Department of Power Consumption and Energy Efficiency China Electric Power Research Institute Co.Ltd.Beijing 100192China School of Com puter Science Beijing University of Posts and Telecom municationsBeijing 100876China state Grid Corporation of china Beijing 100031China

Network traffic classification,which matches network traffic for a specific class of different granularities,plays a vital role in the domain of network administration and cyber *** the rapid development of network communication techniques,more and more network applications adopt encryption techniques during communication,which brings significant challenges to traditional network traffic classification *** the one hand,traditional methods mainly depend on matching features on the application layer of the ISO/OSI reference model,which leads to the failure of classifying encrypted *** the other hand,machine learning-based methods require human-made features from network traffic data by human experts,which renders it difficult for them to deal with complex network *** this paper,the convolution attention network(CAT)is proposed to overcom those *** an end-to-end model,CAT takes raw data as input and returns classification results automatically,with engineering by human *** CAT,firstly,the importance of different bytes with an attention mechanism of network traffic is ***,convolution neural network(CNN)is used to learn features automatically and feed the output into a softmax function to get classification *** enables CAT to learn enough information from network traffic data and ensure the classified *** experiments on the public encrypted network traffic dataset ISCX2016 demonstrate the effectiveness of the proposed model.

关键词： network traffic classification convolution neural network attention mechanism network management cyber security

Multi-policy threshold signature with distinguished signing authorities

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The Journal of china Universities of Posts and Telecommunications 2011年第1期18卷 113-120页

作者： WANG Feng ZHOU You-sheng GU li-ze ZHENG Shi-hui YANG Yi-xian information security Center State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China key laboratory of Network and information Attack and Defence Technology Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China

Threshold signature plays an important role to distribute the power of a single authority in modem electronic society. In order to add functions and improve efficiency of threshold signatures, a multi-policy threshold signature scheme with distinguished signing authorities is proposed. In the scheme two groups can sign and verify each other, so the scheme is two-way signing and verifying. Moreover, the threshold values of the two groups can change with the security classification of the signing document, every discretionary signatory only signs a small part of the document instead of the whole one, so the bandwidth of data transmission for group signature construction can be reduced and the size of group signature is equivalent to that of any individual signature.

关键词： threshold signature multi-policy group verified distinguished signing authorities

High-efficiency all-dielectric transmission metasurface for linearly polarized light in the visible region

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Photonics Research 2018年第6期6卷 517-524页

作者： liU YANG DONG wu YUMIN liU CHANG liU ZENGhui XU hui li ZHONGYUAN YU li YU RAN YE state key laboratory of information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876 China School of Science Beijing University of Posts and Telecommunications Beijing 100876 China

We propose and numerically investigate an efficient transmission-mode metasurface that consists of quasi- continuous trapezoid-shaped crystalline silicon nanoantennas on a quartz substrate. This metasurface provides a linear phase gradient and realizes both full 2Jr phase shift and high transmission efficiency in the operating wavelength range from 740 to 780 nm. At the central wavelength around 751 nm, the total transmission efficiency is up to 88.0% and the section of the desired anomalous refraction is 80.4%. The anomalous refraction angle is 29.62°, and larger refraction angle can be achieved by changing the period of the super cell. We demonstrate a refraction angle as large as 38.59°, and the anomalous transmission efficiency reaches 76.6% at wavelength of 741 nm. It is worth mentioning that the structure is much simpler than conventional metasurfaces based on arrays of discrete nanoantennas. Our research may pave the way for designing efficient all-dielectric phase-gradient metasurfaces and applying them in integrated optical devices for wavefront control.

关键词： Metamaterials Phase shift Integrated optics devices