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XPull: A Relay-Based Blockchain Intercommunication Framework Achieving Cross-Chain State Pulling

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Chinese Journal of Electronics 2024年第5期33卷 1261-1273页

作者： Xinyu LIANG Jing CHEN ruiying du School of Cyber Science and Engineering Wuhan University

Cross-chain technology, which enables different blockchains to intercommunicate with one another,is challenging. Many existing cross-chain platforms, such as Polkadot and Cosmos, generally adopt a relay-based scheme: A relaychain(relay blockchain) receives and records the state information from every parachain(parallel blockchain), and publish the information on the platform, by which parachains are able to efficiently acquire the state information from one another. In the condition when parachain is consortium blockchain, the cross-chain platform cannot work properly. On the one hand, whether state information is submitted to relaychain is completely decided by the internal decision of parachain. The timeliness of state information cannot be guaranteed. On the other hand, the transfer of state information will be interrupted due to the failure of parachain or relaychain-parachain connection. In this paper, we propose a relay-based blockchain intercommunication framework, called XPull(crosspulling). Specifically, to ensure the timeliness of state information, we propose a cross-chain state pulling scheme based on cosigned state pulling agreement. To solve the interruption of state transfer, we propose a random scheduling scheme to resume the transfer, or confirm the failure of parachain. The security analysis and experimental results demonstrate that XPull is secure and efficient.

关键词： Processor scheduling Real-time systems Blockchains Consensus protocol Security Relays

Sentiment Analysis of Code-Mixed Bambara-French Social Media Text Using Deep Learning Techniques

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Wuhan University Journal of Natural Sciences 2018年第3期23卷 237-243页

作者： Arouna KONATE du ruiying State Key Laboratory of Software Engineering/School of Computer Wuhan University Wuhan 430072 Hubei China Collaborative Innovation Center of Geospatial Technology Wuhan 430079 Hubei China

The global growth of the Internet and the rapid expansion of social networks such as Facebook make multilingual sentiment analysis of social media content very necessary. This paper performs the first sentiment analysis on code-mixed Bambara-French Facebook comments. We develop four Long Short-term Memory（LSTM）-based models and two Convolutional Neural Network（CNN）-based models, and use these six models, Na？ve Bayes, and Support Vector Machines（SVM） to conduct experiments on a constituted dataset. Social media text written in Bambara is scarce. To mitigate this weakness, this paper uses dictionaries of character and word indexes to produce character and word embedding in place of pre-trained word vectors. We investigate the effect of comment length on the models and perform a comparison among them. The best performing model is a one-layer CNN deep learning model with an accuracy of 83.23 %.

关键词： sentiment analysis code-mixed Bambara-French Facebook comments deep learning Long Short-Term Memory(LSTM) Convolutional Neural Network(CNN)

Biosorption mechanisms involved in immobilization of soil Pb by Bacillus subtilis DBM in a multi-metal-contaminated soil

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Journal of Environmental Sciences 2014年第10期26卷 2056-2064页

作者： Jun Bai Xiuhong Yang ruiying du Yanmei Chen Shizhong Wang Rongliang Qiu School of Environmental Science and Engineering Sun Yat-sen University Guangdong Key Laboratory of Environmental Pollution Control and Remediation Technology

Mechanisms of soil Pb immobilization by Bacillus subtilis DBM, a bacterial strain isolated from a heavy-metal-contaminated soil, were investigated. Adsorption and desorption experiments with living bacterial cells as well as dead cells revealed that both extracellular adsorption and intracellular accumulation were involved in the Pb2＋removal from the liquid phase. Of the sequestered Pb（II）, 8.5% was held by physical entrapment within the cell wall, 43.3% was held by ion-exchange, 9.7% was complexed with cell surface functional groups or precipitated on the cell surface, and 38.5% was intracellularly *** of Pb2＋with carboxyl, hydroxyl, carbonyl, amido, and phosphate groups was demonstrated by Fourier transform infrared spectroscopic analysis. Precipitates of Pb5（PO4）3OH, Pb5（PO4）3Cl and Pb10（PO4）6（OH）2that formed on the cell surface during the biosorption process were identified by X-ray diffraction analysis. Transmission electron microscopy–energy dispersive spectroscopic analysis confirmed the presence of the Pb（II）precipitates and that Pb（II） could be sequestered both extracellularly and *** with B. subtilis DBM significantly decreased the amount of the weak-acid-soluble Pb fraction in a heavy-metal-contaminated soil, resulting in a reduction in Pb bioavailability, but increased the amount of its organic-matter-bound fraction by 71%. The ability of *** DBM to reduce the bioavailability of soil Pb makes it potentially useful for bacteria-assisted phytostabilization of multi-heavy-metal-contaminated soil.

关键词： Bacillus subtilis DBM Biosorption mechanisms Immobilization Pb speciation Precipitation

SSEM： Secure, Scalable and Efficient Multi-Owner Data Sharing in Clouds

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China Communications 2016年第8期13卷 231-243页

作者： Shungan Zhou ruiying du Jing Chen Hua Deng Jian Shen Huanguo Zhang The Key Laboratory of Aerospace Information Security and Trusted Computing Ministry of Education Computer School of Wuhan University Wuhan 430072 Hubei Province China State Grid Information and Communication Company of Hunan Electric Power Corp Changsha 410000 Hunan Province China

Data sharing is a main application of cloud computing. Some existing solutions are proposed to provide flexible access control for outsourced data in the cloud. However, few attentions have been paid to group-oriented data sharing when multiple data owners want to share their private data for cooperative purposes. In this paper, we put forward a new paradigm, referred to as secure, scalable and efficient multi-owner(SSEM) data sharing in clouds. The SSEM integrates identity-based encryption and asymmetric group key agreement to enable group-oriented access control for data owners in a many-to-many sharing pattern. Moreover, with SSEM, users can join in or leave from the group conveniently with the privacy of both group data and user *** proposed the key-ciphertext homomorphism technique to construct an SSEM scheme with short ciphertexts. The security analysis shows that our SSEM scheme achieves data security against unauthorized accesses and collusion attacks. Both theoretical and experimental results confirm that our proposed scheme takes users little costs to share and access outsourced data in a group manner.

关键词： data sharing cloud computing asymmetric key agreement access control

FACOR：Flexible Access Control with Outsourceable Revocation in Mobile Clouds

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China Communications 2016年第4期13卷 136-150页

作者： ZHOU Shungan du ruiying CHEN Jing SHEN Jian DENG Hua ZHANG Huanguo The Key Laboratory of Aerospace Information Security and Trusted Computing Ministry of Education Computer School of Wuhan University Wuhan 430072 China State Grid Information and Communication Company of Hunan Electric Power Corp Changsha 410000 China

Access control is a key mechanism to secure outsourced data in mobile clouds. Some existing solutions are proposed to enforce flexible access control on outsourced data or reduce the computations performed by mobile devices. However, less attention has been paid to the efficiency of revocation when there are mobile devices needed to be revoked. In this paper, we put forward a new solution, referred to as flexible access control with outsourceable revocation(FACOR) for mobile clouds. The FACOR applies the attribute-based encryption to enable flexible access control on outsourced data, and allows mobile users to outsource the time-consuming encryption and decryption computations to proxies, with only requiring attributes authorization to be fully trusted. As an advantageous feature, FACOR provides an outsourceable revocation for mobile users to reduce the complicated attribute-based revocation operations. The security analysis shows that our FACOR scheme achieves data security against collusion attacks and unauthorized accesses from revoked users. Both theoretical and experimental results confirm that our proposed scheme greatly reliefs the mobile devices from heavy encryption and decryption computations, as well as the complicated revocation of access rights in mobile clouds.

关键词： mobile cloud computing ABE outsourcing user revocation

BotGuard： Lightweight Real-Time Botnet Detection in Software Defined Networks

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Wuhan University Journal of Natural Sciences 2017年第2期22卷 103-113页

作者： CHEN Jing CHENG Xi du ruiying HU Li WANG Chiheng State Key Laboratory of Software Engineering/School of Computer Wuhan University Wuhan 430072 Hubei China

The distributed detection of botnets may induce heavy computation and communication costs to network devices. Each device in related scheme only has a regional view of Internet, so it is hard to detect botnet comprehensively. In this paper, we propose a lightweight real-time botnet detection framework called Bot-Guard, which uses the global landscape and flexible configurability of software defined network （SDN） to identify botnets promptly. SDN, as a new network framework, can make centralized control in botnet detection, but there are still some challenges in such detections. We give a convex lens imaging graph （CLI-graph） to depict the topology characteristics of botnet, which allows SDN controller to locate attacks separately and mitigate the burden of network devices. The theoretical and experimental resuits prove that our scheme is capable of timely botnet detecting in SDNs with the accuracy higher than 90% and the delay less than 56 ms.

关键词： botnet detection software defined network graph theory

A Message Digest Disposing Algorithm Based on RC4

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Wuhan University Journal of Natural Sciences 2010年第3期15卷 251-254页

作者： LIUYabin CHEN Jing du ruiying ZHANG Huanguo School of Computer Wuhan University Wuhan 430072 Hubei China

The characteristics of the wireless network determine the requirement of lightweight cryptography. Towards the huge cost of an existing algorithm such as MD5, this paper proposes a message digest scheme based on the RC4 algorithm which broadens the application area of the RC4 and decreases the requirement of resource or cost. To test the randomicity of the algorithm＇s di- gest, fifteen kinds of randomicity test to NIST randomicity test standard had been done, and the comparative analysis which compares the digest＇s randomicity of the algorithm with MD5 had been performed as well. The performance of the algorithm had been analyzed in aspects of mono-directivity, randomicity, practicality and complexness. Statistic tests and analysis results illustrated that our scheme was of low cost of computing, good statistic performance, high running speed and lightweight.

关键词： RC4 message digest algorithm cryptography information security

Time effects of rice straw and engineered bacteria on reduction of exogenous Cu mobility in three typical Chinese soils

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Pedosphere 2022年第5期32卷 665-672页

作者： Hanzhi SHI Dian WEN Yongdong HUANG Shoujun XU Tenghaobo DENG Furong LI Zhichao WU Xu WANG Peihua ZHAO Fuhua WANG ruiying du Institute of Quality Standard and Monitoring Technology for Agro-Products Guangdong Academy of Agricultural SciencesGuangzhou 510640(China) Key Laboratory of Testing and Evaluation for Agro-Product Safety and Quality Ministry of Agriculture and Rural AffairsGuangzhou 510640(China) Guangdong Provincial Key Laboratory of Quality&Safety Risk Assessment for Agro-Products Guangzhou 510640(China)

Globally,copper(Cu)accumulation in soils is a major environmental *** organic waste and some bacterial species can readily absorb metals in an eco-friendly manner,and thus are commonly used in metal-contaminated soil *** study investigates the change in Cu fractions during the aging process and the time effects of rice straw(RS)and engineered bacteria(EB)(Pseudomonas putida X4/pIME)on reduction of Cu *** typical Chinese soils(red,cinnamon,and black soils)were incubated with RS or RS+EB in the presence of exogenous Cu for 24 *** soil physicochemical properties,reactive soil components,Cu fractions,and Cu mobility were determined over *** Cu mobility factor(MF)values were the lowest in the black soil(6.4-9.2)because of its high organic carbon and clay *** additions of both RS and RS+EB accelerated Cu stabilization during the aging process in all three *** Cu MF values decreased with time during the initial 20 months;however,the MF values increased thereafter in all soils,which might be due to the reduction of humic substances and amorphous iron oxides and the increase in iron oxides complexed on the organic *** reduction rates of Cu MF were similar after 16,24,and more than 24 months in the red,cinnamon,and black soils,respectively,indicating that RS and RS+EB could limit Cu mobility at different times in various *** RS treatment showed the greatest efficiency in reducing Cu mobility in the red,cinnamon,and black soils after 12,12,and 8 months of incubation,*** RS+EB treatment was more efficient than the RS treatment in the red soil during the initial 8 months of the incubation *** study provides theoretical support for Cu risk assessments and RS supplementation for Cu remediation in different soils.

关键词： aging Cu distribution mobility factor sequential extraction soil incubation

Intrusion Detection Model Based on Incomplete Information Ga me in Wireless Mesh Networks

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China Communications 2012年第10期9卷 23-32页

作者： Chen Jing du ruiying Yu Fajiang Zheng Minghui Zhang Huanguo Computer School Wuhan University Wuhan 430079 P. R. China Department of Computer Science Hubei University for Nationalities Enshi 445000 P. R. China

Wireless Mesh Networks （WMNs） have many applications in homes, schools, enterprises, and public places because of their useful characteristics, such as high bandwidth, high speed, and wide coverage. However, the security of wireless mesh networks is a precondition for practical use. Intrusion detection is pivotal for increasing network security. Considering the energy limitations in wireless mesh networks, we adopt two types of nodes： Heavy Intrusion Detection Node （HIDN） and Light Intrusion Detection Node （LIDN）. To conserve energy, the LIDN detects abnorrml behavior according to probability, while the HIDN, which has sufficient energy, is always operational. In practice, it is very difficult to acquire accurate information regarding attackers. We propose an intrusion detection model based on the incomplete inforrmtion game （ID-IIG）. The ID-IIG utilizes the Harsanyi transformation and Bayesian Nash equilibrium to select the best strategies of defenders, although the exact attack probability is unknown. Thus, it can effectively direct the deployment of defenders. Through experiments, we analyze the perforrmnce of ID-IIG and verify the existence and attainability of the Bayesian Nash equilibrium.

关键词： game theory intrusion detection model WMNs