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Event-Triggered Differentially Private Average Consensus for Multi-agent Network

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IEEE/CAA Journal of Automatica Sinica 2019年第1期6卷 75-83页

作者： Aijuan Wang xiaofeng liao Haibo He the College of Computer Science Chongqing University the School of Electronics and Information Engineering Southwest University the Department of Electrical Computer and Biomedical EngineeringUniversity of Rhode Island Kingston IEEE Chongqing Key Laboratory of Nonlinear Circuits and Intelligent Information Processing

This paper investigates the differentially private problem of the average consensus for a class of discrete-time multi-agent network systems(MANSs). Based on the MANSs,a new distributed differentially private consensus algorithm(DPCA) is developed. To avoid continuous communication between neighboring agents, a kind of intermittent communication strategy depending on an event-triggered function is established in our DPCA. Based on our algorithm, we carry out the detailed analysis including its convergence, its accuracy, its privacy and the trade-off between the accuracy and the privacy level, respectively. It is found that our algorithm preserves the privacy of initial states of all agents in the whole process of consensus computation. The trade-off motivates us to find the best achievable accuracy of our algorithm under the free parameters and the fixed privacy level. Finally, numerical experiment results testify the validity of our theoretical analysis.

关键词： Average consensus differentially private event-triggered communication multi-agent network systems (MANSs)

An Optimized Sanitization Approach for Minable Data Publication

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Big Data Mining and Analytics 2022年第3期5卷 257-269页

作者： Fan Yang xiaofeng liao College of Computer Science Chongqing UniversityChongqing 400044China

Minable data publication is ubiquitous since it is beneficial to sharing/trading data among commercial companies and further facilitates the development of data-driven ***,the minable data publication is often implemented by publishers with limited privacy concerns such that the published dataset is minable by malicious *** prohibits minable data publication since the published data may contain sensitive ***,it is urgently demanded to present some approaches and technologies for reducing the privacy leakage *** this end,in this paper,we propose an optimized sanitization approach for minable data publication(named as SA-MDP).SA-MDP supports association rules mining function while providing privacy protection for specific *** SA-MDP,we consider the trade-off between the data utility and the data privacy in the minable data publication *** address this problem,SA-MDP designs a customized particle swarm optimization(PSO)algorithm,where the optimization objective is determined by both the data utility and the data ***,we take advantage of PSO to produce new particles,which is achieved by random mutation or learning from the best ***,SA-MDP can avoid the solutions being trapped into local ***,we design a proper fitness function to guide the particles to run towards the optimal ***,we present a preprocessing method before the evolution process of the customized PSO algorithm to improve the convergence ***,the proposed SA-MDP approach is performed and verified over several *** experimental results have demonstrated the effectiveness and efficiency of SA-MDP.

关键词： data publication data sanitization association rules hiding evolutionary algorithm

Some characteristics of logistic map over the finite field

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Science China(Information Sciences) 2019年第3期62卷 199-201页

作者： Bo YANG xiaofeng liao Chongqing Key Laboratory of Nonlinear Circuits and Intelligent Information Processing College of Electronic and Information Engineering Southwest University

Dear editor,Chaotic maps have good characteristics, which include randomness, sensitivity to the initial value,and unpredictability. Hence, there have been many attempts to discuss the dynamic behavior of chaotic maps... 详细信息

关键词： Some characteristics of logistic map over the finite field

Practical cloud storage auditing using serverless computing

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Science China(Information Sciences) 2024年第3期67卷 33-47页

作者： Fei CHEN Jianquan CAI Tao XIANG xiaofeng liao College of Computer Science and Software Engineering Shenzhen University College of Computer Science Chongqing University

Cloud storage auditing research is dedicated to solving the data integrity problem of outsourced storage on the cloud. In recent years, researchers have proposed various cloud storage auditing schemes using different techniques. While these studies are elegant in theory, they assume an ideal cloud storage model;that is, they assume that the cloud provides the storage and compute interfaces as required by the proposed schemes. However, this does not hold for mainstream cloud storage systems because these systems only provide read and write interfaces but not the compute interface. To bridge this gap, this work proposes a serverless computing-based cloud storage auditing system for existing mainstream cloud object storage. The proposed system leverages existing cloud storage auditing schemes as a basic building block and makes two adaptations. One is that we use the read interface of cloud object storage to support block data requests in a traditional cloud storage auditing scheme. Another is that we employ the serverless computing paradigm to support block data computation as traditionally required. Leveraging the characteristics of serverless computing, the proposed system realizes economical, pay-as-you-go cloud storage auditing. The proposed system also supports mainstream cloud storage upper layer applications(e.g., file preview) by not modifying the data formats when embedding authentication tags for later auditing. We prototyped and open-sourced the proposed system to a mainstream cloud service, i.e., Tencent Cloud. Experimental results show that the proposed system is efficient and promising for practical use. For 40 GB of data, auditing takes approximately 98 s using serverless computation. The economic cost is 120.48 CNY per year, of which serverless computing only accounts for 46%. In contrast, no existing studies reported cloud storage auditing results for real-world cloud services.

关键词： cloud storage auditing serverless computing object storage usability

An Optimized Vertical Handoff Algorithm Based on Markov Process in Vehicle Heterogeneous Network

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China Communications 2015年第4期12卷 106-116页

作者： MA Bin DENG Hong XIE Xianzhong liao xiaofeng School of Computer Science and Technology Chongqing University of Posts and Telecommunications College of Computer Science Chongqing University

In order to solve the problem the existing vertical handoff algorithms of vehicle heterogeneous wireless network do not consider the diversification of network's status, an optimized vertical handoff algorithm based on markov process is proposed and discussed in this paper. This algorithm takes into account that the status transformation of available network will affect the quality of service(Qo S) of vehicle terminal's communication service. Firstly, Markov process is used to predict the transformation of wireless network's status after the decision via transition probability. Then the weights of evaluating parameters will be determined by fuzzy logic method. Finally, by comparing the total incomes of each wireless network, including handoff decision incomes, handoff execution incomes and communication service incomes after handoff, the optimal network to handoff will be selected. Simulation results show that: the algorithm proposed, compared to the existing algorithm, is able to receive a higher level of load balancing and effectively improves the average blocking rate, packet loss rate and ping-pang effect.

关键词： vehicle heterogeneous network vertical handoff markov process fuzzy logic multi-attribute decision

Adaptive image encryption scheme based on chaotic map

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High Technology Letters 2013年第1期19卷 76-81页

作者：邱劲 liao xiaofeng Xiao Di Xiang Tao College of Computer Science and Engineering Chongqing University College of Computer and Information Science Southwest University

Most of the existing image encryption schemes with the substitutlon-chltuslon structure are not secure and efficient. In this letter, a chaos-based pseudo-random bit generator with good statistical properties is proposed, where a simple post-processing by compressing is employed. A new adaptive image encryption scheme with the substitution-diffusion architecture is designed using the new pseu- do-random bit generator. In the scheme, the session key for the pseudo-random bit generator is dependent on the content of the image which ensures that the scheme can effectively resist knownplaintext and chosen-plaintext attacks. Theoretical analysis and computer simulation indicate that the proposed algorithm is efficient and highly secure.

关键词： image encryption chaotic map substitution-diffusion chaotic key stream

2021年9月16日四川泸县M S6.0地震前地磁扰动异常特征分析

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地震工程学报 2025年第1期47卷 229-239页

作者：王玮铭冯志生朱培育廖晓峰何畅张致伟四川省地震局四川成都610041 江苏省地震局江苏南京210000 上海市地震局上海200001

选取四川地区3个地磁扰动台站的观测数据,利用基于脉冲幅度法的地磁垂直强度极化方法,对2021年9月16日四川泸县M S6.0地震前的地磁扰动异常演化特征进行分析。研究结果表明:(1)在中强地震前,台站的垂直强度极化值和超阈值极化值频次逐... 详细信息

选取四川地区3个地磁扰动台站的观测数据,利用基于脉冲幅度法的地磁垂直强度极化方法,对2021年9月16日四川泸县M S6.0地震前的地磁扰动异常演化特征进行分析。研究结果表明:(1)在中强地震前,台站的垂直强度极化值和超阈值极化值频次逐日变化均会出现高值异常,其中频次异常呈现先增强后降低,再增强-降低的形态;(2)发生异常变化的多个台站距离震中300 km范围内,时间上属准同步变化;(3)地震多发生在异常出现的一个月后,频次异常值往往是研究时段的最高值;(4)机理上,这些异常演化形态和特征是由岩石的破裂特性决定的,一定程度上反映了地震的孕育过程;(5)这种震前的地磁扰动异常与外源场无关。

关键词：地磁扰动地磁垂直强度极化法泸县M S6.0地震异常特征

Improved evolutionary algorithm and its application in PID controller optimization

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Science China(Information Sciences) 2020年第9期63卷 303-305页

作者： Dewen QIAO Nankun MU xiaofeng liao Junqing LE Fan YANG College of Electronic and Information Engineering Southwest University School of Computer Science and Engineering South China University of Technology College of Computer Chongqing University

Dear editor,As a common control loop feedback mechanism,the proportional-integral-derivative (PID) controller has been widely applied in industrial control systems [1–3]. The PID control method is simple,stable, and ... 详细信息

关键词： PID controller evolutionary algorithm nonlinear regressive function linear dynamic strategy elite strategy

CHAOS-BASED SECURE COMMUNICATIONS

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China Communications 2020年第5期17卷 I0001-I0002页

作者： xiaofeng liao Shutang Liu Chengqing Li Yulong Zou the College of Computer Science Chongqing UniversityIEEE the Shangdong University the College of Computer Science and Electronic Engineering Hunan University the Nanjing University of Posts and Telecommunications(NUPT)

With the massive increase of wirelessly connected devices and the rapid development of the Internet, information is transmitted more and more frequently. Since the information transmissions over these networks are greatly threatened not only by the imperfection of channels but also by the potential attackers or eavesdroppers, security and reliability become some of the crucial requirements for our future networks. Due to the complex dynamic behavior, ergodicity, wide spectrum and sensitivity to initial values, chaos signals show most required attributes of good cryptosystems and great potentials in optical fiber communications for desirable spatial accuracy and distance. In this context, it has become imperative to investigate and apply chaos theories to solve emerging secure communication problems in various networks. This includes leveraging chaos systems and signals to address a wide range of secure communication challenges in optical fiber communications, chaos cipher, image encryption, etc.

关键词： image CHAOS-BASED SECURE COMMUNICATIONS