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EFFICIENT CERTIFICATELESS THRESHOLD SIGNATURES WITHOUT RANDOM ORACLES

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Journal of Systems Science & Complexity 2010年第6期23卷 1167-1182页

作者： Piyi YANG Zhenfu cao xiaolei DONG Department of Computer Science and Engineering Shanghai Jiaotong University Shanghai 200240 China.

This paper defines the security notion for Certificateless Threshold Signatures （CLTHS）. Different from the adversarial model defined by Wang, et al. （2007）, our definition considers Type I and Type II adversary separately. At the same time, the authors develop the simulatability and relationship between certificateless threshold signature and the underlying certificateless signature. We also propose the first CLTHS scheme which is proved existentially unforgeable against adaptively chosen message attack without random oracles. Compared with the previous scheme by Wang, et al. （2007）, our scheme does not use hash function and is more efficient.

关键词： Certificateless digital signature key escrow provable security threshold robustness simulatabiltiy.

Comparison of Mg^(2+)- and Ca^(2+)-enhancing anaerobic granulation in an expanded granular sludge-bed reactor

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Science China Chemistry 2014年第11期57卷 1596-1601页

作者： cao xiaolei SHENG YuXing cao HongBin ZHANG Yi National Key Laboratory of Biochemical Engineering and Key Laboratory of Green Process and Engineering Institute of Process Engineering Chinese Academy of Sciences National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Graduate University of Chinese Academy of Sciences

The mechanisms responsible for the fast granulation of anaerobic sludge caused by Mg2+ and Ca2+ addition was examined in four lab-scale expanded granular sludge bed(EGSB) reactors. Results indicated that both Mg2+ and Ca2+ accelerated the sludge-granulation process and increased the amount of polysaccharides and proteins in the sludge. Energy dispersive x-ray spectrometry(EDX) analysis revealed that, in a mature granule, both Mg2+ and Ca2+ composed as phosphate and calcium was distributed primarily in the periphery of the granule, while magnesium distributed mainly in the interior. The addition of Mg2+ was more favorable for the nuclei formation, whereas the addition of Ca2+ was more favorable for subgranule growth and maintaining the granules' rigid structure. Results showed that the addition of Mg2+ in the nuclei formation stage and Ca2+ in the granule-growth stage accelerated granulation more than adding only one of them in the granulation process.

关键词： anaerobic granulation Ca2+ augmentation EPS Mg2+ augmentation

AWK-TIS:An Improved AK-IS Based on Whale Optimization Algorithm and Truncated Importance Sampling for Reliability Analysis

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Computer Modeling in Engineering & Sciences 2023年第5期135卷 1457-1480页

作者： Qiang Qin xiaolei cao Shengpeng Zhang Aerospace Science and Industry Corporation Defense Technology Research and Test Center Beijing100854China Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Engineering MechanicsTsinghua UniversityBeijing100084China

In this work,an improved active kriging method based on the AK-IS and truncated importance sampling(TIS)method is proposed to efficiently evaluate structural *** novel method called AWK-TIS is inspired by AK-IS and RBF-GA previously published in the *** innovation of the AWK-TIS is that TIS is adopted to lessen the sample pool size significantly,and the whale optimization algorithm(WOA)is employed to acquire the optimal Krigingmodel and themost probable point(MPP).To verify the performance of theAWK-TISmethod for structural reliability,four numerical cases which are utilized as benchmarks in literature and one real engineering problem about a jet van manipulate mechanism are *** results indicate the accuracy and efficiency of the proposed method.

关键词： Structural reliability active kriging whale optimization algorithm AK-IS

Spatial distribution of bacterial community in EGSB reactor treating synthetic sulfate-containing wastewater at low organic loading rate

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Chinese Science Bulletin 2014年第1期59卷 54-61页

作者： Kai Zhang xiaolei cao Yuxing Sheng Hongbin cao National Key Laboratory of Biochemical Engineering Institute of Process Engineering Chinese Academy of Sciences National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Graduate University of Chinese Academy of Sciences

Given that the consumption of organic substances entails costly biodesulfurization,the characteristics of the bacterial community in a reactor should be determined to increase the desulfurizing rate under low organic loading *** this study,the bacterial community distribution in the expanded granular sludge bed reactor used to treat sulfate-containing wastewater with low organic loading rate was determined by polymerase chain reaction-denaturing gradient gel electrophoresis(PCRDGGE)and 16S rDNA clone library *** results showed that the predominant bacteria were stable and accounted for*90%sulfate removal *** in band positions and intensities indicated that the distribution and abundance of bacteria were affected by their positions in the *** bands were identified in the bacterial community comprising Desulfovibrio,Desulfomicrobium,Thiomonas,Acinetobacter,Bacteroidetes,and *** functions in the reactor were also *** possible links between the functional and microbial responses were also investigated based on the characteristic and spatial distribution of each bacterium in consortium.

关键词： EGSB反应器有机负荷率硫酸盐废水细菌群落空间分布合成废水 PCR-DGGE 膨胀颗粒污泥床反应器

Designing efficient proxy signature schemes for mobile communication

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Science in China(Series F) 2008年第2期51卷 183-195页

作者： LU RongXing DONG xiaolei cao ZhenFu Department of Computer Science and Engineering Shanghai Jiao Tong University Shanghai 200030 China

Proxy signature is an active cryptographic research area, and a wide range of literatures can be found nowadays suggesting improvement and generalization of existing protocols in various directions. However, from the efficiency view, many proposed proxy signature schemes in these literatures are not satisfying and cannot fit to the mobile communication. Therefore, there is a desire to design efficient proxy signature schemes. Based on Boneh et al＇s pairing-based short signature, this paper presents two proxy signature schemes. One is proxy-protected signature scheme, and the other is proxy aggregate signature scheme. Since both of them can achieve high efficiency, it is believed that they are specially suitable for mobile communication environment.

关键词： proxy signature proxy protected signature proxy aggregate signature bilinear pairings provable secure,efficiency

THRESHOLD PROXY RE-SIGNATURE

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Journal of Systems Science & Complexity 2011年第4期24卷 816-824页

作者： Piyi YANG Zhenfu cao xiaolei DONG Department of Computer Science and Engineering Shanghai Jiaotong University Shanghai 200240 China.

The focus of this paper is to design an efficient and secure solution addressing the semi trusted issue in proxy re-signature schemes, i.e., the proxy knows the re-signature key from user A to user B, so he is able to translate any signatures made by user A to user B, which damages the essential requirement （＂non-repudiation＂ property） of proxy re-signature schemes. In this paper, the authors first define the security model for threshold proxy re-signature scheme, and then propose two threshold proxy re-signature schemes based on Ateniese-Hohenberger＇s and Shao-cao-Wang-Liang＇s approach.

关键词： Proxy re-signature robust threshold unforgeable.

New designing of cryptosystems based on quadratic fields

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Science in China(Series F) 2008年第8期51卷 1106-1116页

作者： DONG xiaolei cao ZhenFu WANG LiCheng Department of Computer Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China

This paper proposes a method to construct new kind of non-maximal imaginary quadratic order （NIQO＊） by combining the technique of Diophantine equation and the characters of non-maximal imaginary quadratic order. It is proved that in the class group of this new kind of NIQO＊, it is very easy to design provable secure cryptosystems based on quadratic field （QF）. With the purpose to prove that this new kind of QF-based cryptosystems are easy to implement, two concrete schemes are presented, i.e., a Schnorr-like signature and an EIGamel-like encryption, by using the proposed NIQO＊. In the random oracle model, it is proved that：（1） under the assumption that the discrete logarithm problem over class groups （CL-DLP） of this new kind of NIQO＊ is intractable, the proposed signature scheme is secure against adaptive chosen-message attacks, i.e., achieving UF-CMA security; （2） under the assumption that the decisional Diffie-Hellman problem over class groups （CL-DDH） of this new kind of NIQO＊ is intractable, the enhanced encryption in this paper is secure against adaptive chosen-ciphertext attacks, i.e., reaching IND-CCA2 security.

关键词： public key cryptosystem quadratic field cryptography quadratic fields provable security

分枝列当寄生甜瓜时吸器形成过程中内源激素的动态变化

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植物保护 2024年第1期50卷 40-47,96页

作者：田芳张学坤姚兆群董雪曹小蕾赵思峰新疆绿洲农业病虫害治理与植保资源利用自治区高校重点实验室石河子大学农学院石河子832003

本研究采用石蜡切片和显微观察分析分枝列当寄生甜瓜时的吸器形成过程,利用液相色谱-质谱联用(LC-MS)检测吸器形成过程中24种植物内源激素变化。结果表明:分枝列当种子在接种甜瓜根部第3天开始萌发,接种第7天分枝列当吸器顶端稳固地附... 详细信息

本研究采用石蜡切片和显微观察分析分枝列当寄生甜瓜时的吸器形成过程,利用液相色谱-质谱联用(LC-MS)检测吸器形成过程中24种植物内源激素变化。结果表明:分枝列当种子在接种甜瓜根部第3天开始萌发,接种第7天分枝列当吸器顶端稳固地附着在寄主根部,吸器侵入甜瓜根皮层,并在甜瓜根皮层细胞内扩展,扩展过程中形成大量的爪状结构,接种第11天时分枝列当吸器细胞与寄主根维管束连接。共有17种植物激素参与了吸器形成过程,其中生长素类吲哚-3-甲醛含量在列当吸器形成过程中降低了83.36%,细胞分裂素类反式玉米素核苷的含量在增长了5.02倍;油菜素内酯含量增长了481.95倍,推测这3类植物激素在分枝列当吸器形成过程中可能起到重要的调控作用。

关键词：分枝列当甜瓜吸器内源激素

Effects of additive gases on dimethyl ether conversion through dielectric barrier discharge

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Journal of Natural Gas Chemistry 2009年第4期18卷 441-444页

作者： Baowei Wang xiaolei cao Yigang Yan Genhui Xu Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering Technology 7ianjin University Tianjin 300072 China

Effects of additive gases on dimethyl ether （DME） conversion through dielectric barrier discharge （DBD） were investigated. Most of the additive gases tested in this work increased the conversion of DME, but decreased the yield of liquid product. However, the addition of O2 markedly increased both the conversion of DME and the yield of liquid product. The results show that when O2 volume fraction was 39.95%, the conversion of DME was close to 100% and the yield of liquid product reached 34.43%. Different additive gases resulted in different mass fractions variation of components in liquid products.

关键词： dielectric barrier discharge plasma dimethyl ether additive gas