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Leveled Homomorphic Encryption in Certificateless Cryptosystem

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Chinese Journal of Electronics 2017年第6期26卷 1213-1220页

作者： chen hu hu Yupu LIAN Zhizhu State Key Laboratory of Integrated Service Networks Xidian University Jiangsu Key Laboratory of Education Big Data Science and Engineering Jiangsu Normal University

To lower communication complexity, a Certificateless homomorphic encryption(CLHE) scheme based on the Learning with errors(LWE) problem is constructed by introducing a new technique called probabilistic encoding with weakly homomorphic property. This technique can conveniently convert an intended message into two elements in a ring, which will be respectively encrypted under both public keys of a user in certificateless *** knowing both elements simultaneously, the original message can be easily recovered. It is hidden perfectly by the probabilistic property of encoding. This CLHE removes evaluation keys by using the approximate eigenvector method given by Gentry et al., which makes it into a pure CLHE. It is proven to be semantic secure in the Random oracle model(ROM). The results indicate it is able to homomorphically evaluate any functions in a class functions with given multiplicative depth L.

关键词： Certificateless cryptosystem Lattice cryptography Fully homomorphic encryption Learning with errors Random oracle model

Double Batch for RLWE-Based Leveled Fully Homomorphic Encryption

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Chinese Journal of Electronics 2015年第3期24卷 661-666页

作者： chen hu hu Yupu LIAN Zhizhu State Key Laboratory of Integrated Service Networks Xidian University

To further improve the efficiency of Fully homomorphic encryption(FHE), a leveled FHE scheme based on the Ring learning with errors(RLWE) problem is put forward by simultaneously applying both batch techniques available. Our scheme therefore allows double packing many plaintext values into each ciphertext to support single-instruction-multiple-data-type operations, which effectively reduces the ciphertext expansion ratio. An efficient evolutionary method for achieving arbitrary homomorphic permutation operations on a packed ciphertext is also provided by using several given key-switching ***, a few new operations are introduced, with which not only to describe the key switching process in our batch setting clearly, but also to analyze the noise growth conveniently.

关键词： Fully homomorphic encryption Ring learning with errors Batch technique Circular security

Properties of SV-Style Homomorphic Encryption and Their Application

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Chinese Journal of Electronics 2017年第5期26卷 926-932页

Several special properties of Smart and Vercauteren’s encryption scheme are put *** are all based on the special parameter,which is a recommended modulus *** properties not only show that the secret key is deduced from an N-dimensional vector into its any entry,but also produce the triplet(grade-i reduced plaintext space,grade-i reduced ciphertext space,grade-i reduced secret key) for each i,where grade-i reduced secret key can decrypt grade-i reduced ciphertexts and can be efficiently computed from grade-i delegated *** the same time,sequentially grade-(i + 1)delegated key can be efficiently computed from grade-i delegated *** work also discusses a sequential computation in opposite direction,i.e.,computing grade-i delegated key from grade-(i + 1) delegated *** the sequential computation in the opposite direction is difficult except at most the first steps of such sequential *** on the properties given,we then propose a simple hierarchical encryption scheme with relatively small key and ciphertext sizes.

关键词： Lattice-based cryptosystem Fully homomorphic encryption Hierarchical encryption

Confining ultrahigh oxygen vacancy SnO_(2) nanocrystals into nitrogen-doped carbon for enhanced Li-ion storage kinetics and reversibility

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Journal of Energy Chemistry 2022年第6期31卷 450-455,I0013页

作者： Ying Liu chen hu Ling chen Yanjie hu Hao Jiang Chunzhong Li Key Laboratory for Ultrafine Materials of Ministry of Education School of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China Shanghai Engineering Research Center of Hierarchical Nanomaterials Frontiers Science Center for Materiobiology and Dynamic ChemistrySchool of Chemical EngineeringEast China University of Science and TechnologyShanghai 200237China

Oxygen vacancies (V_(o)) engineering has been deemed to an effective tactic for enhancing Li-ion storage kinetics and reversibility of SnO_(2)-based anode ***,we demonstrated the confinement of ultrahigh V_(o)SnO_(2) nanocrystals into N-doped carbon frameworks to boost their high-rate and cycle *** functional theory (DFT) calculations reveal that abundant V_(o) in SnO_(2) facilitates the adsorption to Li-ion with remarkably increased carrier *** 6.0 nm-sized SnO_(2) particles and the embedded design effectively stabilize the structural integrity during de-/***,the as-formed large hetero-interface also expedites the electron *** merits guarantee its high-rate performance and superior cycling ***,this sample exhibits a high capacity of 1368.9m Ah g^(-1)at 0.1 A g^(-1),and can still maintain 488.5 mAh g^(-1)at 10 A g^(-1)and a long life over 400 cycles at 5 A g^(-1)with 96.6%capacity retention,which is among the best report for Sn-contained anode *** work sheds light on ultrahigh Vo and structural design in conversion-type oxides for highperformance lithium-ion batteries (LIBs).

关键词： Li-ion batteries SnO_(2) Oxygen vacancy Confined synthesis Rate capability

Numerical and Experimental Study on Contact Face and Shock Wave Motion in the Receiving Tube of Gas Wave Refrigerator

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Journal of Thermal Science 2006年第4期15卷 337-341页

作者： Dapeng hu Shengtao chen hu LIU Zuzhi chen Che Zhu Institute of Chemical Engineering Dalian University of Technology Dalian Liaoning China

The contact face and shock wave motion in an open ends receiving tube of gas wave refrigerator are investigated numerically and experimentally. The results show that, velocity of the contact face rises rapidly as gas is injected into the receiving tube, and drops sharply after a steady propagation. However, velocity of the shock wave in the tube is almost linear. With increasing of inlet pressure, velocity of the shock wave and steady velocity of contact face also increase. In addition, time and distance of contact face propagation in the receiving tube become longer.

关键词： contact face shock wave receiving tube gas wave refrigerator

Distributed adaptive Kalman filter based on variational Bayesian technique

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Control Theory and Technology 2019年第1期17卷 37-47页

作者： chen hu Xiaoming hu Yiguang HONG Rocket Force University of Engineering Xi'an Shannxi 710025 China epartment of Mathematics Royal Institute of Sweden (KTH) Sweden Institute of Systems Science and University of Chinese Academy of Sciences Chinese Academy of Sciences Beijing 700790 China

In this paper, distributed Kalman filter design is studied for linear dynamics with unknown measurement noise variance, which modeled by Wishart distribution. To solve the problem in a multi-agent network, a distributed adaptive Kalman filter is proposed with the help of variational Bayesian, where the posterior distribution of joint state and noise variance is approximated by a free-form distribution. The con vergence of the proposed algorithm is proved in two main steps: n oise statistics is estimated, where each age nt only use its local information in variational Bayesian expectation (VB-E) step, and state is estimated by a consensus algorithm in variational Bayesian maximum (VB-M) step. Finally, a distributed target tracking problem is investigated with simulations for illustration.

关键词： Distributed Kalman filter adaptive filter multi-agent system variational Bayesian

A Portable Fall Detection and Alerting System Based on k-NN Algorithm and Remote Medicine

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China Communications 2015年第4期12卷 23-31页

作者： HE Jian hu chen School of Software Engineering Beijing University of Technology

This paper presents information on a portable fall detection and alerting system mainly consisting of a custom vest and a mobile smart phone. A wearable motion detection sensor integrated with tri-axial accelerometer, gyroscope and Bluetooth is built into a custom vest worn by elderly. The vest can capture the reluctant acceleration and angular velocity about the activities of daily living(ADLs) of elderly in real time. The data via Bluetooth is then sent to a mobile smart phone running a fall detection program based on k-NN algorithm. When a fall occurs the phone can alert a family member or health care center through a call or emergent text message using a built in Global Positioning System. The experimental results show that the system discriminates falls from ADLs with a sensitivity of 95%, and a specificity of 96.67%. This system can provide remote monitoring and timely help for the elderly.

关键词： telemedicine fall detection k-NN smart phone bluetooth

Confining MoS_(2) nanocrystals in MOF-derived carbon for high performance lithium and potassium storage

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Green Energy & Environment 2021年第1期6卷 75-82页

作者： chen hu Kun Ma Yanjie hu Aiping chen Petr Saha Hao Jiang Chunzhong Li Key Laboratory for Ultrafine Materials of Ministry of Education Shanghai Engineering Research Center of Hierarchical NanomaterialsSchool of Materials Science and EngineeringEast China University of Science&TechnologyShanghai200237China Centre of Polymer Systems University InstituteTomas Bata University in ZlinTrida T.Bati 567876001ZlinCzech Republic

Developing an efficient synthesis protocol to simultaneously control 2D nanomaterials’size and dispersion is the pivot to optimize their electrochemical ***,we report the synthesis of uniform MoS_(2) nanocrystals well-anchored into the void space of porous carbon(donated as MoS_(2)3C hybrids)by a simple confined reaction in metal–organic framework(MOF)during carbonization *** strong confinement effect refrain MoS2 growth and aggregation,generating abundant active centers and edges,which contribute fast lithium/potassium reaction *** addition to the hybridization with the derived carbon,the MoS_(2)3C hybrids exhibit rapid Liþtransfer rate(~109 cm^(2) s 1)and greatly improved electronic ***,the MoS23C hybrids show ultrafast rate performances and satisfactory cycling stabilities as anode materials for both lithium and potassium ion *** work demonstrates a universal tactic to achieve high dispersive 2D nanomaterials with tailorable particle size.

关键词： Confined reaction MoS_(2) Nanocrystals Metal–organic framework Energy storage

Understanding microstructure-evolution-dependent fracture behaviors in pearlitic steels

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Journal of Iron and Steel Research International 2020年第3期27卷 334-341页

作者： hu chen Chi Zhang Hao chen Zhi-gang Yang Lei chen Key Laboratory of Advanced Materials of Ministry of Education School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Department of Mechanical Engineering Mississippi State UniversityStarkvilleMS 39762USA

Microstructure evolution or degradation has been well recognized to be closely related to the formation of microcracks in pearlitic rails and *** rolling contact fatigue machine was employed to simulate the rail-wheel contact,and the microstructure evolution and crack formation of pearlitic steels subjected to rolling-sliding contact loading were then experimentally *** further quantitatively predict the fracture behaviors,a phase-field model was herein established to investigate the cyclic loading-driven microstructure evolution and the microstructure-dependent fracture resistance in *** coupling of microstructure evolution and crack propagation was realized through the introduction of two-set order parameters,i.e.,the crack field and the microstructure field,and the microstructure-dependent fracture *** proposed model can predict the fracture resistance of microstructure at different depths from the contact surface,after different rolling cycles and with different initial pearlitic microstructures,which can shed light on the design of damage-resistant microstructure of pearlitic steels.

关键词： Pearlitic steel Rolling-sliding contact Microstructure evolution Crack propagation Phase-field model