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| 1 | Identifying the vulnerabilities of bitcoin anonymous mechanism based on address clustering显示文摘The anonymity mechanism of bitcoin is favored by the society, which promotes its usage and development. An adversary should not be able to discover the relation between bitcoin addresses and bitcoin users to ensure effective privacy. However, the relation among bitcoin transactions can be used to analyze the bitcoin privacy information, which seriously jeopardizes the bitcoin anonymity. Herein, we describe the vulnerabilities associated with the anonymity mechanism of bitcoin, including the relation among bitcoin addresses and the relation among bitcoin users. Further, we demonstrate that the existing methods do not guarantee the comprehensiveness, accuracy, and efficiency of the analysis results. We propose a heuristic clustering method to judge the relation among bitcoin addresses and employ the Louvain method to discover the relation among bitcoin users. Subsequently, we construct an address-associated database of historical transactions and implement real-time updates. Extensive experiments are used to demonstrate the comprehensiveness, accuracy, and efficiency of the proposed scheme. Specifically, the proposed scheme reveals the privacy vulnerability associated with the blockchain technology. We expect that our scheme can be applied to improve the blockchain technology. | Baokun ZHENG Liehuang ZHU Meng SHEN Xiaojiang DU Mohsen GUIZANI | 2020 | Science China(Information Sciences)2020，63，3： | 4 |
| 2 | PPLS: a privacy-preserving location-sharing scheme in mobile online social networks显示文摘The recent proliferation of mobile devices has given rise to mobile online social networks(m OSNs), an emerging network paradigm that uses social networks as its main design element. As one of the most critical components in m OSNs, location sharing plays an important role in helping users share information and strengthen their social bonds, which however may compromise users’ privacy, including location information and social relationship details. To address these challenges, some solutions have been proposed. However, none of them considers the privacy of inter-user threshold distance, which effectively can be used to identify users, their friends, and location information, by malicious or undesired elements of the system. To overcome this limitation, we propose a secure distance comparison protocol. Furthermore,we present a privacy-preserving location-sharing scheme(PPLS), which allows users to build more complex access control policies. The safety of our scheme is validated by the security analysis and the experimental results demonstrate the efficiency of PPLS scheme. | Chang XU Xuan XIE Liehuang ZHU Kashif SHARIF Chuan ZHANG Xiaojiang DU Mohsen GUIZANI | 2020 | Science China(Information Sciences)2020，63，3： | 2 |
| 3 | An effective key management scheme for heterogeneous sen- sor networks显示文摘 | DU Xiaojiang XIAO Yang Guizani Mohsen | 2007 | Ad Hoc Networks2007，5，1： | 1 |
| 4 | A frame- work for a distributed key management scheme in hetero- geneous wireless sensor networks 显示文摘 | LU Kejie QIAN Yi Guizani Mohsen | 2008 | IEEE Transactions on Wireless Communications2008，7，2： | 1 |
| 5 | Self-Regulating Network Utilization in Mobile Ad Hoc Wireless Networks显示文摘 | Song Ci Mohsen Guizani | 2006 | IEEE Transactions on Vehicular Technology2006，55，4： | 1 |
| 6 | A Survey of Se- cure Mobile Ad Hoe Routing Protocols 显示文摘 | Loay Abusalah Ashfaq Khokhar Mohsen Guizani | 2008 | Communications Sur- veys and Tutorials IEEE2008，10，4： | 1 |
| 7 | Bandwidth aggregation-aware dynamic QoS negotiation for real-time video streaming in next-generation wire- less networks显示文摘 | Juan Carlos Fernandez Tarik Taleb Mohsen Guizani | 2009 | IEEE Transactions on Multimedia2009，11，6： | 1 |
| 8 | Overview of development and regulatory aspects of high altitude platform system显示文摘High Altitude Platform(HAP)systems comprise airborne base stations deployed above 20 km and below 50 km to provide wireless access to devices in large areas.In this paper,two types of applications using HAP systems:one with HAP Station(HAPS)and the other with HAPS as International Mobile Telecommunication(IMT)Base Station(HIBS)are introduced.The HAP system with HAPS has already received wide recognition from the academia and the industry and is considered as an effective solution to provide internet access between fixed points in suburban and rural areas as well as emergencies.HAP systems with HIBS to serve IMT user terminal have just started to draw attention from researchers.The HIBS application is expected to be an anticipate mobile service application complementing the IMT requirement for cell phone or other mobile user terminals in which the service field of HAPS application cannot reach.After describing and characterizing the two types of systems,coexistence studies and simulation results using both the Power Fluxed Density(PFD)mask and separation distance based methods are presented in this paper.This paper also predicts future trends of the evolution paths for the HAP systems along with challenges and possible solutions from the standpoint of system architectures and spectrum regulation. | Dong Zhou Sheng Gao Ruiqi Liu Feifei Gao Mohsen Guizani | 2020 | Intelligent and Converged Networks2020，1，1： | 1 |
| 9 | A Survey of Secure Mobile Ad Hoc Routing Protocols显示文摘 | Loay Abusalah Ashfaq Khokhar Mohsen Guizani | 2008 | IEEE Communicattons Surveys&Tutorials2008，，4： | 1 |
| 10 | A framework for a distributed key management scheme in heterogeneous wireless sensor networks 显示文摘 | Lu Ke-jie Qian Yi Guizani Mohsen | 2008 | IEEE Transactions on Wire- less Communications2008，7，2： | 1 |
| 11 | SR-DCSK Cooperative Communication System with Code Index Modulation:A New Design for 6G New Radios显示文摘This paper proposes a high-throughput short reference differential chaos shift keying cooperative communication system with the aid of code index modulation,referred to as CIM-SR-DCSK-CC system.In the proposed CIM-SR-DCSK-CC system,the source transmits information bits to both the relay and destination in the first time slot,while the relay not only forwards the source information bits but also sends new information bits to the destination in the second time slot.To be specific,the relay employs an N-order Walsh code to carry additional log_(2)N information bits,which are superimposed onto the SRDCSK signal carrying the decoded source information bits.Subsequently,the superimposed signal carrying both the source and relay information bits is transmitted to the destination.Moreover,the theoretical bit error rate(BER)expressions of the proposed CIMSR-DCSK-CC system are derived over additive white Gaussian noise(AWGN)and multipath Rayleigh fading channels.Compared with the conventional DCSKCC system and SR-DCSK-CC system,the proposed CIM-SR-DCSK-CC system can significantly improve the throughput without deteriorating any BER performance.As a consequence,the proposed system is very promising for the applications of the 6G-enabled lowpower and high-rate communication. | Yi Fang Wang Chen Pingping Chen Yiwei Tao Mohsen Guizani | 2023 | China Communications2023，20，10： | 0 |
| 12 | Differential Scheme for Reconfigurable Intelligent Surface-Based Spatial Modulation System显示文摘In this paper,a differential scheme is proposed for reconfigurable intelligent surface(RIS)assisted spatial modulation,which is referred to as RISDSM,to eliminate the need for channel state information(CSI)at the receiver.The proposed scheme is an improvement over the current differential modulation scheme used in RIS-based systems,as it avoids the high-order matrix calculation and improves the spectral efficiency.A mathematical framework is developed to determine the theoretical average bit error probability(ABEP)of the system using RIS-DSM.The detection complexity of the proposed RIS-DSM scheme is extremely low through the simplification.Finally,simulations results demonstrate that the proposed RIS-DSM scheme can deliver satisfactory error performance even in low signal-to-noise ratio environments. | Han Hai Si Wei Xueqin Jiang Yuyang Peng Mohsen Guizani | 2023 | China Communications2023，20，10： | 0 |
| 13 | Design of Protograph LDPC-Coded MIMO-VLC Systems with Generalized Spatial Modulation显示文摘This paper investigates the bit-interleaved coded generalized spatial modulation(BICGSM) with iterative decoding(BICGSM-ID) for multiple-input multiple-output(MIMO) visible light communications(VLC). In the BICGSM-ID scheme, the information bits conveyed by the signal-domain(SiD) symbols and the spatial-domain(SpD) light emitting diode(LED)-index patterns are coded by a protograph low-density parity-check(P-LDPC) code. Specifically, we propose a signal-domain symbol expanding and re-allocating(SSER) method for constructing a type of novel generalized spatial modulation(GSM) constellations, referred to as SSERGSM constellations, so as to boost the performance of the BICGSM-ID MIMO-VLC systems.Moreover, by applying a modified PEXIT(MPEXIT) algorithm, we further design a family of rate-compatible P-LDPC codes, referred to as enhanced accumulate-repeat-accumulate(EARA) codes,which possess both excellent decoding thresholds and linear-minimum-distance-growth property. Both analysis and simulation results illustrate that the proposed SSERGSM constellations and P-LDPC codes can remarkably improve the convergence and decoding performance of MIMO-VLC systems. Therefore, the proposed P-LDPC-coded SSERGSM-mapped BICGSMID configuration is envisioned as a promising transmission solution to satisfy the high-throughput requirement of MIMO-VLC applications. | Dai Lin Fang Yi Guan Yongliang Mohsen Guizani | 2024 | China Communications2024，21，3： | 0 |
| 14 | A Trust-Based Hierarchical Consensus Mechanism for Consortium Blockchain in Smart Grid显示文摘As the smart grid develops rapidly,abundant connected devices offer various trading data.This raises higher requirements for secure and effective data storage.Traditional centralized data management does not meet the above requirements.Currently,smart grid with conventional consortium blockchain can solve the above issues.However,in the face of a large number of nodes,existing consensus algorithms often perform poorly in terms of efficiency and throughput.In this paper,we propose a trust-based hierarchical consensus mechanism(THCM)to solve this problem.Firstly,we design a hierarchical mechanism to improve the efficiency and throughput.Then,intra-layer nodes use an improved Raft consensus algorithm and inter-layer nodes use the Byzantine Fault Tolerance algorithm.Thirdly,we propose a trust evaluation method to improve the election process of Raft.Finally,we implement a prototype system to evaluate the performance of THCM.The results demonstrate that the consensus efficiency is improved by 19.8%,the throughput is improved by 12.34%,and the storage is reduced by 37.9%. | Xingguo Jiang Aidong Sun Yan Sun Hong Luo Mohsen Guizani | 2023 | Tsinghua Science and Technology2023，28，1： | 0 |
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