Browsing by Author "Rachedi, Abderrezak"

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A blockchain-based framework to secure vehicular social networks
(wiley, 2019) Yahiatene, Youcef; Rachedi, Abderrezak; Riahla, Mohamed Amine; Menacer, Djamel Eddine; Nait-Abdesselam, Farid
Vehicular social network is emerging as a new promising concept, combin-ing two types of network paradigms, namely, vehicular networks and socialnetworks. In order to manage efficiently the security and the control of the net-work, this paper proposes a new framework based on the emerging concepts ofsoftware-defined vehicular network (SDVN) and blockchain. Using the SDVNmakes the network more programmable, virtualized, and partitionable. How-ever, on the other hand, it also creates a well-known vulnerability of a singlepoint of failure. Hence, we propose to introduce the blockchain paradigm thatwill enable the certification of transactions and ensure data anonymity in afully distributed manner. To this end, three levels of controllers are needed: aprincipal controller (PC), roadside units (RSUs), and a local controller. In orderto dynamically select miners, a distributed miners connected dominating setalgorithm (DM-CDS) has been proposed. The DM-CDS is a single-phase dis-tributed algorithm that supports a dynamic topology based on a trust model andsome other network parameters, such as the connectivity degree, the averagelink quality indicator, and the rank. The performance of the proposed DM-CDSis evaluated throughout multiple scenarios using different parameters, such astrust metric, node density, node mobility, and radio range. The obtained resultshighlight the importance of such proposed architecture, especially in terms ofnumber of required miners. For instance, when the density of nodes increases,the number of selected miners increases similarly to when the network lengthincreases. The node mobility impacts also on the stability of the selected miners,in terms of withdrawing and joining, showing a variation between 0% and 10%.The trust metric has also an important impact on the selection of miners, as onlynodes with a higher trust level are selected to endorse the roles of miners.
Towards a Blockchain and Software-Defined Vehicular Networks Approaches to Secure Vehicular Social Network
(IEEE, 2018) Yahiatene, Youcef; Rachedi, Abderrezak
In this paper, we propose a new framework based on two main concepts: Software-Defined Vehicular Networks (SDVN) and Blockchain to efficiently manage and secure Vehicular Social Network (VSN). Using SDVN makes the network programmable, virtualized, and partitionable, but also it creates a well-known vulnerability named single-point of failure. Hence we propose to introduce a Blockchain paradigm that enables to certify the transactions and provide anonymity of data in distributed way using miners nodes. To this end, we introduce three levels of controllers: Principal controller (PC), Road Side Units (RSU) and miners. The PC has a global overview of the network like network topology. The RSU is an intermediate between the PC and the miners. We select local controllers acting as miners due to safety and performance. In order to select miners, we propose a Distributed Miners Connected Dominating Set algorithm (DM-CDS). The DM-CDS is a distributed algorithm with a single phase that supports dynamic topology. The selection of miners is based on a function called miner-score which depends on trust parameter particularly trust metric and network parameters such as: the connectivity degree, the average link quality indicator and the rank. The performance of the proposed DM-CDS is evaluated using many scenarios with different parameters like trust metric, node density, node mobility and radio range. The obtained results show the importance of the proposed architecture in terms of number of miners (CDS size) and robustness with different scenarios.
Towards a distributed ABE based approach toprotect privacy on online social networks
(IEEE, 2019) Yahiatene, Youcef; Menacer, Djamel Eddine; Riahla, Mohamed Amine; Rachedi, Abderrezak; Tebibel, Thouraya Bouabana
In this paper, we present a new framework for protecting privacy on online social networks based on two main concepts: cloud computing and Attribute-Based Encryption system (ABE). The cloud computing is used to store outsourcing data by a third party. However, the issues of entrusting these third-party losing control over data arise. Thus, one does not know where data are stored. In the proposed framework we propose to use a distributed multi-authority ABE scheme, which provides flexible access to private data, and only users with the right keys can have access to it. The performance evaluation is conducted by simulations with different parameters including the number of attributes, encryption time and decryption time. The obtained results and security analysis show that our solution outperforms the classical solutions in terms of security and robustness.
Towards Blockchain-Based GDPR-Compliant spontaneous and ephemeral social network
(Institute of Electrical and Electronics Engineers, 2025) Yahiatene, Youcef; Rachedi, Abderrezak; Riahla, Mohamed Amine
Online Social Networks (OSNs) have rapidly integrated into our daily lives since their emergence in 2004, primarily serving as platforms for sharing personal information. This paper introduces a novel category of social networks: Spontaneous and Ephemeral Social Networks (SESNs). Unlike traditional OSNs, SESNs are event-centric, facilitating real-time connections and content sharing among participants within specific contexts. The main objective of SESNs is to improve the production, sharing, and consumption of digital content among network members. SESNs operate on a distributed peer-to-peer architecture using ad hoc mobile networks, leveraging the capability of mobile devices to communicate directly with each other in peer-to-peer mode. SESNs are ephemeral by nature, dissolving once participants disperse from the event location. However, for future analysis, some content may be retrievable from an external server after the event. A potential concern is that collaborative content creation within SESNs resembles crowdsourcing. However, in SESNs, the service provider may retain control over the data even after the event concludes. This centralized management of user-generated content could pose risks to user anonymity. To address these concerns, we propose a blockchain-based architecture that certifies transactions and ensures data anonymity in a decentralized manner. The proposed architecture demonstrates its robustness through a performance evaluation and a comprehensive security analysis. Our solution guarantees data integrity, confidentiality, privacy, anonymity, and network resilience. Additionally, blockchain technology is employed to ensure SESN compliance with the General Data Protection Regulation (GDPR).