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    SHARE-ABE: an efficient and secure data sharing framework based on ciphertext-policy attribute-based encryption and Fog computing
    (Springer, 2022) Saidi, Ahmed; Nouali, Omar; Amira, Abdelouahab
    Attribute-based encryption (ABE) is an access control mechanism that ensures efficient data sharing among dynamic groups of users by setting up access structures indicating who can access what. However, ABE suffers from expensive computation and privacy issues in resource-constrained environments such as IoT devices. In this paper, we present SHARE-ABE, a novel collaborative approach for preserving privacy that is built on top of Ciphertext-Policy Attribute-Based Encryption (CP-ABE). Our approach uses Fog computing to outsource the most laborious decryption operations to Fog nodes. The latter collaborate to partially decrypt the data using an original and efficient chained architecture. Additionally, our approach preserves the privacy of the access policy by introducing false attributes. Furthermore, we introduce a new construction of a collaboration attribute that allows users within the same group to combine their attributes while satisfying the access policy. Experiments and analyses of the security properties demonstrate that the proposed scheme is secure and efficient especially for resource-constrained IoT devices.
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    Enabling ad-hoc collaboration between mobile users in the MESSENGER project
    (Kluwer Academic Publishers-Plenum, 2007-03) Maamar, Zakaria; Mahmoud, Qusay H.; Derhab, Abdelouahid
    This paper discusses how ad-hoc collaboration boosts the operation of a set of messengers. This discussion continues the research we earlier initiated in the MESSENGER project, which develops data management mechanisms for UDDI registries of Web services using mobile users and software agents. In the current operation mode of messengers, descriptions of Web services are first, collected from UDDI registries and later, submitted to other UDDI registries. This submission mode of Web services descriptions does not foster the tremendous opportunities that both wireless technologies and mobile devices offer. When mobile devices are “close” to each other, they can form a mobile ad-hoc network that permits the exchange of data between these devices without any pre-existing communication infrastructure. By authorizing messengers to engage in ad-hoc collaboration, collecting additional descriptions of Web services from other messengers can happen, too. This has several advantages, but at the same time poses several challenges, which in fact highlight the complexity of ad-hoc networks.
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    Toward a business process collaboration in E-commerce exchange using Web serice
    (CERIST, 2009) Khelifa, Lydia Nadia; Aklouf, Youcef; Drias, Habiba; Boumellil, Lamia Sabiha
    B2B e-commerce is an emergent area, which the profit of enterprises depend on its performance. Business Process collaboration is a challenge that companies are facing to. However, emergent specifications resulted from the convergence of web services and grid i-e Web Service Resource Framework (WSRF) open new horizon for the collaboration of business Processes. WSRF specifies a WS-Resource approach to model and manage state in a Web services context. In this paper, we present our vision of integrating WSRF in business process collaboration which is described through a collaborative Business Process defined by all participants. WSRF is used to virtualize and encapsulate the private Business Processes. The WS-Notification is used to notify about the state changes to coordinate participant Business Processes
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    Towards an IT-Based Platform for Disaster Risks Management in Algeria
    (2013-05) Benssam, Ali; Nouali-Taboudjemat, Nadia; Nouali, Omar
    Disaster management and risk prevention in Algeria have undergone many changes in the recent years. Important efforts have been provided on the legal and organizational sides to set the right conditions for an integrated and collaborative framework for disaster management in the country. The aim is to address the lack of information sharing, coordination and collaboration among the involved organizations. However, although the enhancement of the organizational arrangements, several problems persist mainly related to the implementation of these measures. To address this issue, in this paper, we propose an IT based platform in the field of risks prevention and disaster management (DM). This platform provides decision support, enables information sharing, helps to enhance public awareness regarding risks and disasters, supports communication and dissemination of information and alerts in disaster situations and facilitates the implementation of regulation related to disaster management.