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VenomAttack: automated and adaptive activity hijacking in Android

Frontiers of Computer Science 2023年第1期17卷 187-204页

作者： Pu SUN Sen CHEN Lingling FAN pengfei gao Fu SONG Min YANG School of Information Science and Technology ShanghaiTech UniversityShanghai 201210China Shanghai Institute of Microsystem and Information Technology Chinese Academy of SciencesShanghai 200050China University of Chinese Academy of Sciences Beijing 100049China College of Intelligence and Computing Tianjin UniversityTianjin 300350China College of Cyber Science Nankai UniversityTianjin 300350China School of Computer Science Fudan UniversityShanghai 200438China

Activity hijacking is one of the most powerful attacks in Android. Though promising, all the prior activity hijacking attacks suffer from some limitations and have limited attack capabilities. They no longer pose security threats in recent Android due to the presence of effective defense mechanisms. In this work, we propose the first automated and adaptive activity hijacking attack, named VenomAttack, enabling a spectrum of customized attacks (e.g., phishing, spoofing, and DoS) on a large scale in recent Android, even the state-of-the-art defense mechanisms are deployed. Specifically, we propose to use hotpatch techniques to identify vulnerable devices and update attack payload without re-installation and re-distribution, hence bypassing offline detection. We present a newly-discovered flaw in Android and a bug in derivatives of Android, each of which allows us to check if a target app is running in the background or not, by which we can determine the right attack timing via a designed transparent activity. We also propose an automated fake activity generation approach, allowing large-scale attacks. Requiring only the common permission INTERNET, we can hijack activities at the right timing without destroying the GUI integrity of the foreground app. We conduct proof-of-concept attacks, showing that VenomAttack poses severe security risks on recent Android versions. The user study demonstrates the effectiveness of VenomAttack in real-world scenarios, achieving a high success rate (95%) without users’ awareness. That would call more attention to the stakeholders like Google.

关键词： Android activity hijacking Android security mobile security

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The relative contributions of soil hydrophilicity and raindrop impact to soil aggregate breakdown for a series of textured soils

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International Soil and Water Conservation Research 2022年第3期10卷 433-444页

作者： Jiangwen Li Shouqin Zhong Zhen Han pengfei gao Chaofu Wei College of Resources and Environment/Key Laboratory of Eco-environments in Three Gorges Region(Ministry of Education) Southwest UniversityChongqing400715China College of Forestry Guizhou UniversityGuiyang550025China Key Laboratory of Arable Land Conservation(Southwestern China) Ministry of AgricultureChongqing400715China State Cultivation Base of Eco-agriculture for Southwest Mountainous Land Southwest UniversityChongqing400715China

Soil aggregate breakdown is the first key factor that causes soil erosion.At present,research on the mechanisms of soil aggregate breakdown during rainfall is common.However,the research to on quantifying the relative contributions of internal and external forces to aggregate breakdown remains limited.This paper was conducted to analyse the relative contribution of internal and external forces to aggregate disintegration and the factors affecting aggregate stability during rainfall.Soil aggregates with a series of textures were selected as test soil samples;deionized water was employed as the soaking solution and rainfall material in static disintegration experiments and rainfall simulation tests.The effect of internal force(soil hydrophilicity)on aggregate disintegration was analysed by the static disintegration method,and the combined effects of internal force(soil hydrophilicity)and external force(raindrop impact)on soil aggregate breakdown were analysed by rainfall simulation experiments.The results indicated that external force caused more severe soil aggregate breakdown than internal force,and the crushed aggregate was mainly distributed in the range of 2–0.25 mm.With increasing rainfall kinetic energy,the degree of aggregate breakdown increased gradually,and the degree of aggregation of the soil particles decreased gradually.Furthermore,soil aggregates with a high clay content(>30%)were more stable than medium-clay(20–30%)and low-clay(<20%)soil aggregates,and the correlation coefficient provided a good representation of the relationship between the clay content and soil aggregate stability index(ASI).Therefore,external force contributed more to soil aggregate breakdown than internal force during rainfall,and clay plays an important role in aggregate stability.The results of this study are of great significance for elaborating the mechanism and factors affecting aggregate breakdown.

关键词： Aggregate breakdown External force Internal force Soil texture

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Mesoscale deformation mechanisms in relation with slip and grain boundary sliding in TA15 titanium alloy during tensile deformation

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Journal of Materials Science & Technology 2022年第3期98卷 72-86页

作者： Yanxi Li pengfei gao Jingyue Yu Shuo Jin Shuqun Chen Mei Zhan State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of High-Performance Precision Forming Technology and EquipmentSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Key Laboratory of Advanced Functional Materials Education Ministry of ChinaSchool of Materials Science and EngineeringBeijing University of TechnologyBeijing 100124China

Revealing the mesoscale deformation mechanisms of titanium alloy with tri-modal microstructure is of great significance to improve its mechanical properties. In this work, the collective behavior and mechanisms of slip activities, slip transfer, and grain boundary sliding of tri-modal microstructure were investigated by the combination of quasi-in-situ tensile test, SEM, EBSD and quantitative slip trace analyses. It is found that the slip behavior presents different characteristics in the equiaxed α(α_(p)) and lamellar α(α_(l))grains. Under a low level of deformation, almost all the slip deformation is governed by single basal and prismatic slips for both of α_(p)and α_(l),despite small amount of -pyramidal slip exists in α_(l)grains. As deformation proceeds, -pyramidal and -pyramidal slip systems with high Schmid factors were activated in quantities. Specially, certain coarse prismatic slip bands were produced across both of single and colony α_(l)grains whose major axes tilting about 40 °–70 ° from the tensile axis. Slip transfer occurs at the boundaries of α_(p)/α_(p)and α_(l)/β under the condition that there exists perfect alignment between two slip systems and high Schmid factors of outgoing slip system. The slip transfer across α_(l)/β boundary can be divided into two types: straight slip transfer and deflect slip transfer with a deviation angle of 5 °–12 °, depending on the alignment of slip planes of two slip systems. The grain boundary sliding along boundaries of α_(l)/β and α_(p)/β was captured by covering micro-grid on tensile sample. It is found that the crystallographic orientation and the geometrical orientation related to loading axis play great roles in the occurrence of grain boundary sliding.

关键词： Titanium alloy Tri-modal microstructure Slip modes Slip transfer Grain boundary sliding

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NEHASH:high-concurrency extendible hashing for non-volatile memory

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Frontiers of Information Technology & Electronic Engineering 2023年第5期24卷 703-715页

作者： Tao CAI pengfei gao Dejiao NIU Yueming MA Tianle LEI Jianfei DAI School of Computer Science and Communication Engineering Jiangsu UniversityZhenjiang 212013China

Extendible hashing is an effective way to manage increasingly large file system metadata,but it suffers from low concurrency and lack of optimization for non-volatile memory(NVM).In this paper,a multilevel hash directory based on lazy expansion is designed to improve the concurrency and efficiency of extendible hashing,and a hash bucket management algorithm based on groups is presented to improve the efficiency of hash key management by reducing the size of the hash bucket,thereby improving the performance of extendible hashing.Meanwhile,a hierarchical storage strategy of extendible hashing for NVM is given to take advantage of dynamic random access memory(DRAM)and NVM.Furthermore,on the basis of the device driver for Intel Optane DC Persistent Memory,the prototype of high-concurrency extendible hashing named NEHASH is implemented.Yahoo cloud serving benchmark(YCSB)is used to test and compare with CCEH,level hashing,and cuckoo hashing.The results show that NEHASH can improve read throughput by up to 16.5%and write throughput by 19.3%.

关键词： Extendible hashing Non-volatile memory(NVM) High concurrency

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Formability enhancement in hot spinning of titanium alloy thin-walled tube via prediction and control of ductile fracture

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Chinese Journal of Aeronautics 2022年第2期35卷 320-331页

作者： pengfei gao Chao YU Mingwang FU Lu XING Mei ZHAN Jing GUO State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of High-Performance Precision Forming Technology and EquipmentSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHung HornKowloonHong Kong 999077China Institute of Chemical Materials China Academy of Engineering PhysicsMianyang 621900China

The damage and fracture in hot spinning of titanium alloy is a very complex process under the combined effects of microstructure evolution and stress state.In this study,their dependences on processing parameters were investigated by an integrated FE model considering microstructure and damage evolution,and revealing the effects of microstructure and stress states on damage evolution.The results show that the inner surface of workpiece with the largest voids volume fraction is the place with the greatest potential of fracture.This is mainly attributed to the superposition effects of positive stress triaxiality and the smallest dynamic recrystallization(DRX)fraction andβphase fraction at the inner surface.The damage degree is decreased gradually with the increase of initial spinning temperature and roller fillet radius.Meanwhile,it is first decreased and then increased with the increases of spinning pass and roller feed rate,which can be explained based on the variations ofβphase fraction,DRX fraction,stress state and tensile plastic strain with processing parameters.In addition,the dominant influencing mechanisms were identified and discussed.Finally,the thickness reduction without defect in the hot spinning of TA15 alloy tube is greatly increased by proposing an optimal processing scheme.

关键词： Control of ductile fracture Dynamic recrystallization Forming limit Hot spinning Titanium alloy tube

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Total conversion of centimeter-scale nickel foam into single atom electrocatalysts with highly selective CO_(2)electrocatalytic reduction in neutral electrolyte

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Nano Research 2023年第2期16卷 2003-2010页

作者： Qikui Fan pengfei gao Shan Ren Yunteng Qu Chuncai Kong Jian Yang Yuen Wu Ministry of Education Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter Shaanxi Province Key Laboratory of Advanced Functional Materials and Mesoscopic PhysicsSchool of PhysicsXi’an Jiaotong UniversityXi’an 710049China Shenzhen Key Laboratory of Special Functional Materials Guangdong Research Center for Interfacial Engineering of Functional MaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhen 518060China Northwest Institute of Nuclear Technology Xi’an 710024China Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China State Key Laboratory of Photoelectric Technology and Functional Materials International Collaborative Center on Photoelectric Technology and Nano Functional MaterialsInstitute of Photonics and Photon-TechnologyNorthwest UniversityXi’an 710069China Department of Chemistry iChEM(Collaborative Innovation Center of Chemistry for Energy Materials)University of Science and Technology of ChinaHefei 230026China

To improve the atomic utilization of metals and reduce the cost of industrialization,the one-step total monoatomization of macroscopic bulk metals,as opposed to nanoscale metals,is effective.In this study,we used a thermal diffusion method to directly convert commercial centimeter-scale Ni foam to porous Ni single-atom-loaded carbon nanotubes(CNTs).As expected,owing to the coating of single-atom on porous,highly conductive CNT carriers,Ni single-atom electrocatalysts(Ni-SACs)exhibit extremely high activity and selectivity in CO_(2)electroreduction(CO_(2)RR),yielding a current density of>350 mA/cm^(2),a selectivity for CO of>91%under a flow cell configuration using a 1 M potassium chloride(KCl)electrolyte.Based on the superior activity of the Ni-SACs electrocatalyst,an integrated gas-phase electrochemical zero-gap reactor was introduced to generate a significant amount of CO current for potential practical applications.The overall current can be increased to 800 mA,while maintaining CO Faradaic efficiencies(FEs)at above 90%per unit cell.Our findings and insights on the active site transformation mechanism for macroscopic bulk Ni foam conversion into single atoms can inform the design of highly active single-atom catalysts used in industrial CO_(2)RR systems.

关键词： Ni single atom electrocatalyst CO_(2)electroreduction to CO neutral electrolyte thermal diffusion

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Design of manganese ion coated Prussian blue nanocarrier for the therapy of refractory diffuse large B-cell lymphoma based on a comprehensive analysis of ferroptosis regulators from clinical cases

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Nano Research 2023年第4期16卷 5265-5278页

作者： Yulu Yang Rui Chen Ke Li pengfei gao Yi Gong Weihu Yang Kaiyong Cai Key Laboratory of Biorheological Science and Technology Ministry of Education College of BioengineeringChongqing UniversityChongqing 400044China Department of Pathology Chongqing University Cancer HospitalChongqing 400030China Department of Phase I Clinical Trial Ward Chongqing University Cancer HospitalChongqing 400030China

Diffuse large B-cell lymphoma(DLBCL)is a prevalent human malignancy,and understanding its biology will help identify problems in refractory patients and customize alternative therapies for them.We found that DLBCL can be stratified into two independent subtypes with different clinical characteristics and outcomes by consensus clustering of expression of ferroptosis regulatory genes,which proves that ferroptosis is effective in treating refractory cases.In this work,we constructed a novel ferroptosis nanocarrier(PBPMn@PEG)by coating Prussian blue nanoparticles with manganese ions and encapsulating them with poly(ethyleneglycol).The low efficiency of the Fenton reaction of Prussian blue nanoparticles can be improved greatly by manganese coating,and can effectively generate hydroxyl radicals,and induce ferroptosis of lymphoma cells(SU-DHL-10 cells)by down-regulating ferroptosis suppressor genes and up-regulating ferroptosis driver genes.It also induces effective cell apoptosis,which is synergistic with ferroptosis for DLBCL therapy.In vivo experiments also prove that PBPMn@PEG achieved a better anti-tumor effect by up-regulating COX2,HO-1/hemeoxygenase-1(HMOX1),and NADPH oxidase-4(NOX4),and downregulating FSP1 and GPX4,with lower biotoxicity.As a novel and potential DLBCL drug carrier,our discovery served as a foundation for the treatment of the refractory DLBCL by inducing ferroptosis for DLBCL treatment in addition to the therapeutic effect of drugs.

关键词： diffuse large B-cell lymphoma(DLBCL) ferroptosis Prussian blue nanoparticles manganese ion tumor therapy

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Luteolin suppresses oral carcinoma 3(OC3) cell growth and migration via modulating polo-like kinase 1(PLK1) expression and cellular energy metabolism

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2023年第12期24卷 1151-1158页

作者： pengfei gao Wentao ZHANG Yujie LIN Ruijie LU Zijian LOU Gang LU Ruolang PAN Yunfang CHEN Center for Plastic&Reconstructive Surgery Department of StomatologyZhejiang Provincial People's Hospital(Affiliated People's Hospital)Hangzhou Medical CollegeHangzhou 310014China School of Stomatology Bengbu Medical CollegeBengbu 233030China The Second Clinical Medical College Wenzhou Medical UniversityWenzhou 325035China Key Laboratory of Cell-Based Drug and Applied Technology Development in Zhejiang Province Hangzhou 31122China

Oral squamous cell carcinoma(OSCC)is a prevalent malignant tumor affecting the head and neck region(Leemans et al.,2018).It is often diagnosed at a later stage,leading to a poor prognosis(Muzaffar et al.,2021;Li et al.,2023).Despite advances in OSCC treatment,the overall 5-year survival rate of OSCC patients remains alarmingly low,falling below 50%(Jehn et al.,2019;Johnson et al.,2020).According to statistics,only 50%of patients with oral cancer can be treated with surgery.Once discovered,it is more frequently at an advanced stage.In addition,owing to the aggressively invasive and metastatic characteristics of OSCC,most patients die within one year of diagnosis.Hence,the pursuit of novel therapeutic drugs and treatments to improve the response of oral cancer to medication,along with a deeper understanding of their effects.

关键词： PLK1 metabolism drugs

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Modeling and Simulation Analysis of Solar Thermal Electric Plants Based on Petri Net

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Energy Engineering 2022年第4期119卷 1711-1728页

作者： Rong Huang Xiaojuan Lu Zeping Liang pengfei gao Tian Liang State Grid Gansu Provincial Electric Power Company Electric Power Research Institute Gansu Provincial Key Laboratory of New Energy Grid-Connected Operation ControlLanzhou730070China Lanzhou Jiaotong University Lanzhou730070China

At present,solar thermal power generation is in the demonstration stage,and the large-scale production is affected by many factors.In view of the characteristics of different operating modes of photothermal power generation,it is analyzed that the turbine needs to be started and stopped frequently due to different operating modes,which will lead to the instability of the output energy and the reduction of power generation efficiency.In this paper,the dynamic equation of energy conversion process is established by using the law of conservation of energy and conservation of mass.Combined with the logic switching criterion of the system,the system model was established by using the extended differential Petri net,and the validity and accuracy of the model were verified.Through the Petri net model of the system,the system’s working mode switching and power generation situation are analyzed due to the difference of direct normal irradiation intensity(DNI).Finally,the accuracy of the model is proved by comparing it with experimental data of the photovoltaic and thermal demonstration projects that have been connected to the grid.

关键词： Solar power hybrid system petri nets direct molten salt mode switch

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Moderated crevice corrosion susceptibility of Ti6Al4V implant material due to albumin-corrosion interaction

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Journal of Materials Science & Technology 2022年第14期109卷 209-220页

作者： Jing Wu Meng Li Chuanchuan Lin pengfei gao Rui Zhang Xuan Li Jixi Zhang Kaiyong Cai Key Laboratory of Biorheological Science and Technology Ministry of EducationCollege of BioengineeringChongqing UniversityChongqing 400044China

Localized corrosion of metallic biomaterials is a concerning problem for implant applications.In the present work,the interaction between localized corrosion of Ti6Al4V implant material and adsorption of bovine serum albumin(BSA)was investigated by electrochemical tests,surface morphological and compositional analysis.The artificial crevice was set up on the Ti6Al4V surface to simulate the crevice corrosion of metallic implants.The results show that the BSA adsorption is regulated by the heterogeneous metallic ion release resulted from the crevice corrosion.The negatively charged BSA prefers to aggregate at the interior of artificial crevice due to electrostatic interaction with the concentrated metallic cations in the crevice.In return,the non-uniform BSA adsorption can decrease the crevice corrosion susceptibility of the Ti6Al4V implant material,even though the presence of BSA accelerates the dissolution of passive films.For the Ti6Al4V alloys with artificial crevice,stable localized corrosion occurs after 96 h of immersion in the PBS free of BSA while no stable localized corrosion can be determined in the presence of 4%BSA.It is deduced that the presence of BSA can reduce the surface potential discrepancy between the crevice interior and the crevice exterior.The disclosed mechanism of albumin-corrosion interaction is vital to the localized corrosion control of metallic implants in clinical use.

关键词： Titanium alloy Albumin Electrochemistry Localized corrosion Protein adsorption

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