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Algebraic-Differential Attacks on a Family of Arithmetization-Oriented Symmetric Ciphers

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Journal of Systems Science & Complexity 2023年第6期36卷 2681-2702页

作者： li Zhengnan wu Baofeng liN Dongdai institute of information Engineering Chinese Academy of SciencesBeijing100085China state key laboratory of Cryptology Beijing100878China School of Cyber security University of Chinese Academy of SciencesBeijing100049China

Motivated by applications in advanced cryptographic protocols,research on arithmetizationoriented symmetric primitives has been rising in the field of symmetric cryptography in recent *** this paper,the authors focus on on the collision attacks for a family of arithmetization-oriented symmetric ciphers *** authors firstly enhance the algebraically controlled differential attacks proposed by introducing more ***,combining algebraic attacks and differential attacks,the authors propose algebraic-differential attacks on GMi *** attack method is shown to be effective by experiments on toy versions of GMi *** authors further introduce some tricks to reduce the complexities of algebraic-differential attacks and improve the success probability of finding collisions.

关键词： Algebraic attacks collisions differential attacks GMiMCHash Grobner basis

Models and measurements of seven years of evapotranspiration on a high elevation site on the Central Tibetan Plateau

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Journal of Mountain Science 2020年第12期17卷 3039-3053页

作者： WANG li-hui HE Xiao-bo Jakob FSTEINER ZHANG Dong-wei wu Jin-kui WANG Shao-yong DING Yong-jian state key laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China University of chinese academy of sciences Beijing 100049China Department of Physical Geography Utrecht UniversityUtrecht 3584CBNetherlands

Evapotrantaspiration is a crucial part of the hydrological cycle but few ground observatories for the Tibetan Plateau *** this study,we present lysimeter measurements from the growing season during seven years at a remote field location on the Tibetan *** measurements show rates between 2.5 and 3 mm·d-1 during the warmer months from June to August,dropping to 2 to 2.5 mm·d-1 in *** results in a total volume of evapotranspiration of approximately 300 mm·yr-1 for the months from June to *** inter-daily variability is however large,and comparison to meteorological variables suggest that this is largely driven by radiation and *** for a single season from a nearby flux tower allows us to compare the two common measurement methods for evapotranspiration in the field,showing an overall good agreement between the *** also tested commonly applied models used to estimate evapotranspiration rates,namely the FAO-PenmanMonteith(PM) and the Priestly-Taylor(PT) model,which both make use of radiation data as well as the simpler Hargreaves-Samani(HS) and Rohwer(R)models which only need air temperature and wind speed as *** most data intensive model(PM)has the lowest root mean square error(RMSE)(1.36 mm·d-1) and the mean bias error(MBE)(-0.05 mm·d-1) and reproduces the daily variability generally *** much simpler HS model performs slightly worse(1.38 and 0.35 mm·d-1),but fails to reproduce the variability,due to its lack of information of local radiation and humidity *** results are in line with large scale estimates of evapotranspiration for the cold and arid region,provide a first long time series of in-situ measurements from a high elevation site and suggest that both the PM and HS models are appropriate when no direct measurements are available.

关键词： Evapotranspiration Alpine meadow FAO-Penman-Monteith Priestley-Taylor Hargreaves-Samani Rohwer Lysimeter

A Trustworthy Path Discovery Mechanism in Ubiquitous Networks

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chinese Journal of Electronics 2016年第2期25卷 312-319页

作者： GENG Kui li Fenghua CAO Jin li hui CHEN Chen ZHANG Cui state key laboratory of Integrated Services Networks Xidian University state key laboratory of information security Institute of Information EngineeringChinese Academy of Sciences beijing Electronic Science and Technology institute

With the evolution of information communication technology, a large number of new applications appear, resulting in kinds of new accessing equipments to be deployed. Since the characteristics of randomness, dynamic and unpredictability of their positions, securely discovering these new equipments is one of a primary challenges to guarantee the security issues for these new applications. Traditional path discovery protocols cannot be directly borrowed and applied onto new service models due to the aforementioned inherent vulnerabilities. In this paper, we propose a Public key infrastructure-based(PKIbased) Trustworthy path discovery mechanism(TPDM),which is further implemented by trustworthy node discovery and neighbor node discovery protocols for new service models. As a result, a source node can discover a trustworthy path to the destination node and each intermediate node can also detect its neighbor nodes. security analysis and evaluation results indicate the effectiveness and efficiency of our proposed mechanism.

关键词： Service models Ubiquitous networks Path discovery Node discovery security

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大数据时代地理空间情报保障能力研究

情报工程 2024年第2期10卷 3-10页

作者：李晴晴张慧寇静行地理信息工程国家重点实验室北京100088

[目的/意义]地理空间情报是通过地理空间数据及相关分析来进行态势感知和支持决策制定的工具,在大数据时代扮演着越来越重要的角色。深入研究地理空间情报保障能力影响因素及对策对提高大数据时代地理空间情报态势感知及决策支持效能、... 详细信息

[目的/意义]地理空间情报是通过地理空间数据及相关分析来进行态势感知和支持决策制定的工具,在大数据时代扮演着越来越重要的角色。深入研究地理空间情报保障能力影响因素及对策对提高大数据时代地理空间情报态势感知及决策支持效能、有效发挥其价值有重要意义。[方法/过程]运用因果分析法从体制、理论、技术、人员四个方面对地理空间情报保障能力影响因素进行分析并提出提升地理空间情报保障能力的对策。[结果/结论]大数据时代,地理空间情报保障工作需完善保障机制、革新技术手段、建设协同环境、重视人才储备以提高地理空间情报保障能力,推动地理空间情报保障工作朝智能化、一体化方向发展。

关键词：大数据地理空间情报情报保障能力情报研究因果分析

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数据驱动的公共卫生安全

科学通报 2024年第9期69卷 1156-1163页

作者：李翠萍吴林寰舒畅鲍一明马俊才宋述慧中国科学院北京基因组研究所(国家生物信息中心) 国家基因组科学数据中心北京100101 中国科学院微生物研究所国家微生物科学数据中心北京100101 中国科学院大学北京100049 中国科学院北京基因组研究所(国家生物信息中心) 基因组科学与信息重点实验室北京100101 中国科学院微生物研究所微生物资源与大数据中心北京100101 中国科学院微生物研究所微生物资源前期开发国家重点实验室北京100101

在现代社会中,数据已成为重要的生产要素和国家基础性战略资源,是维护国家生物安全与社会稳定的利器[1].正确处理和利用数据,有助于我们及时、快速、有效地发现和解决问题,进一步维护社会的和谐稳定发展.在公共卫生安全领域,公共卫生安... 详细信息

在现代社会中,数据已成为重要的生产要素和国家基础性战略资源,是维护国家生物安全与社会稳定的利器[1].正确处理和利用数据,有助于我们及时、快速、有效地发现和解决问题,进一步维护社会的和谐稳定发展.在公共卫生安全领域,公共卫生安全事件成为21世纪人类生存面临的非传统安全威胁之一,特别是新发再发传染病对全球公共卫生和社会经济安全构成严重威胁[2,3].

关键词：公共卫生安全数据驱动非传统安全威胁全球公共卫生和谐稳定发展传染病 21世纪基础性

The Effects of a Low-Temperature GaN Interlayer on the Performance of InGaN/GaN Solar Cells

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chinese Physics Letters 2013年第2期30卷 247-249页

作者： li liang ZHAO De-Gang JIANG De-Sheng liU Zong-Shun CHEN Ping wu liang-liang LE ling-Cong WANG hui YANG hui state key laboratory on Integrated Optoelectronics Institute of SemiconductorsChinese Academy of SciencesP.O.Box 912Beijing 100083 Suzhou institute of Nano-tech and Nano-bionics Chinese Academy of SciencesSuzhou 215123

An InGaN/GaN p-i-n solar cell inserted with a 5-nm low-temperature(LT)GaN interlayer between the p-GaN cap layer and the InGaN i-layer is grown on a c-plane sapphire substrate by metal organic chemical vapor *** effects of the LT GaN interlayer on the performance of the InGaN/GaN solar cells are *** is found that the LT-GaN interlayer prevents the extension of threading dislocations from the InGaN layer to the p-GaN layer and improves the crystal quality of both the p-GaN cap layer and the InGaN i-layer,ultimately leading to an increasing external quantum efficiency and photocurrent density of the InGaN/GaN solar cells.

关键词： InGaN/GaN GaN sapphire

An ultralight,flexible,and biocompatible all-fiber motion sensor for artificial intelligence wearable electronics

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npj Flexible Electronics 2022年第1期6卷 235-242页

作者： Sen lin Shuang Hu Wei Song Miaoqing Gu Junchen liu Jianan Song Zhenglian liu Ziwei li Kun Huang Yufeng wu Ming Lei hui wu School of Physical Science and Technology Guangxi UniversityNanning 530004China Advanced institute for Brain and Intelligence Guangxi UniversityNanning 530004China state key laboratory of information Photonics and Optical Communications and School of Science Beijing University of Posts and TelecommunicationsBeijing 100876China state key laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

New-generation human body motion sensors for wearable electronics and intelligent medicine are required to comply with stringent requirements in terms of ultralight weight,flexibility,stability,biocompatibility,and extreme ***,conventional sensors are hard to fulfill all these criteria due to their rigid structure,high-density sensing materials used as the constituents,as well as hermetical and compact assembly ***,we report an ultralight sensing material based on radial anisotropic porous silver fiber(RAPSF),which has been manufactured by phase separation and temperature-controlled grain growth strategy on a modified blow-spinning *** resistance of RAPSF could be dynamically adjusted depending on the deflected ***,an all-fiber motion sensor(AFMS)with an ultra-low density of 68.70 mg cm^(−3) and an overall weigh of 7.95 mg was fabricated via layer-by-layer *** sensor exhibited outstanding flexibility,breathability,biocompatibility,and remarkable body motion recognition ***,the AFMS was shown to have great potential as an artificial intelligence throat sensor for throat state identification at the accuracy above 85%,allowing one to spot the early onset of the viral throat illness.

关键词： fiber artificial motion

Room-temperature production of silver-nanofiber film for large-area, transparent and flexible surface electromagnetic interference shielding

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npj Flexible Electronics 2019年第1期3卷 56-63页

作者： Sen lin Haiyang Wang Fan wu Qingmin Wang Xiaopeng Bai Di Zu Jianan Song Dong Wang Zhenglian liu Ziwei li Nian Tao Kai Huang Ming Lei Bo li 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 Advanced Materials institute Shenzhen Graduate SchoolTsinghua University518055 ShenzhenChina School of Mechanical Engineering Nanjing University of Science&Technology210094 NanjingChina

A kind of pollution known as electromagnetic interference(EMI),which results from ubiquitous usage of various electronic communication and military radar equipment,has been receiving increasing attention ***,large-area EMI shielding on transparent and/or curved surfaces,including building windows,curved glass wall,and special requirements spaces(SRSs),remains hard to *** this paper,a silver nanofiber(AgNF)based flexible and transparent EMI shielding film was successfully assembled via a room-temperature roll-to-roll production *** transparent application scenario,AgNF with 89%transmittance in visible range and 1μm thickness shows~20 dB shielding efficiency(EMI SE).On the other hand,total shielding(>50 dB)is obtained when the thickness of AgNF increases to 10μm,while its transmittance in visible range remains higher than 75%.Considering the facile and scale-free production technology,this material can be readily applied in large-scale,transparent,and/or SRSs EMI shielding.

关键词： transparent silver film

基于最优控制理论的国产光抽运小铯钟频率控制算法

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物理学报 2024年第6期73卷 108-118页

作者：宋会杰董绍武王翔姜萌章宇郭栋张继海中国科学院国家授时中心时间频率基准实验室西安710600 时间基准及应用重点实验室(中国科学院) 西安710600 中国科学院大学天文与空间科学学院北京100049 西安工程大学电子信息学院西安710048 西安科技大学机械工程学院西安710054

原子钟频率控制是时间保持工作中的关键技术.当前守时工作中的频率控制主要针对国外微波钟采用开环控制算法,但由于国产光抽运小铯钟(下称国产钟)的工作原理和性能不同于国外同类型原子钟,因此该算法不能很好适应国产钟.为了提升我国标... 详细信息

原子钟频率控制是时间保持工作中的关键技术.当前守时工作中的频率控制主要针对国外微波钟采用开环控制算法,但由于国产光抽运小铯钟(下称国产钟)的工作原理和性能不同于国外同类型原子钟,因此该算法不能很好适应国产钟.为了提升我国标准时间的自主性和安全性,本文基于国产钟的噪声特性,在最优控制理论的框架下研究了线性二次高斯控制算法,该算法属于闭环控制算法,从同步时间、频率控制准确度和频率控制稳定度方面研究国产钟性能,最后分析了不同控制间隔对国产钟性能的影响.结果表明随着二次损失函数中约束矩阵W_(R)的增大,同步时间延长,控制准确度降低,控制短期稳定度提高.W_(R)相同情况下,随着控制间隔的增大,同步时间延长,控制准确度降低,控制短期稳定度提高,对于W_(R)=1时,控制间隔为1 h的同步时间为5小时,控制准确度为1.83 ns,1 h的Allan偏差为1.81×10^(-13);控制间隔为8 h的同步时间为28 h,控制准确度为4.48 ns,1 h的Allan偏差为1.48×10^(-13).控制国产光抽运小铯钟的中长期稳定度都得到提高.

关键词：原子钟状态模型线性二次高斯控制 Kalman滤波原子钟噪声