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The complexity of critical programmable systems requests the guarantee of high level of reliability and safety. The dependability studies should be conducted throughout the development cycle of the system. These studies provide better risk management and reliability. The weak points are highlighted, and enable designers to specify reconfiguration strategies before the prototype stage and real testing. The dependability studies must be conducted as soon as possible in the design phase, in order to reduce costs and the number of prototypes necessary to validate the system. The work presented in this thesis aims to define a design methodology of complex systems dedicated to a mechatronic programmable application [Belhadaoui et al., 2008-a], integrating as soon as possible dependability aspects in the development cycle [Aït-Kadi et al., 2000]. The provision of such a methodology must resist face a number of constraints specific to the intelligent sensors field (requirements specifications, compliance with standards legislation). The methodology developed enable to:  Modeling and simulate the functional and dysfunctional behavior of systems.  Estimate the reliability by modelling.  Achieve measures sensitivity to deduce the contribution of each component in the reliability of the system.  Capitalize the system knowledge during different phases of evaluation (planning, experimental and operational) to refine estimations of reliability. This work introduces the concept of information dependability. It interprets the information failure, as a result of the initiation and propagation of failure information through the architecture. This spread has been accompanied by constraints (sharing hardware resource and information, degraded modes of information.), which tend to influence the credibility of this information. We begin on a state of the art to show the interest of the information flow approach in a complex case study. This interest is linked to the presence of programmable part (hardware-software interaction), ...

The complexity of critical programmable systems requests the guarantee of high level of reliability and safety. The dependability studies should be conducted throughout the development cycle of the system. These studies provide better risk management and reliability. The weak points are highlighted, and enable designers to specify reconfiguration strategies before the prototype stage and real testing. The dependability studies must be conducted as soon as possible in the design phase, in order to reduce costs and the number of prototypes necessary to validate the system. The work presented in this thesis aims to define a design methodology of complex systems dedicated to a mechatronic programmable application [Belhadaoui et al., 2008-a], integrating as soon as possible dependability aspects in the development cycle [Aït-Kadi et al., 2000]. The provision of such a methodology must resist face a number of constraints specific to the intelligent sensors field (requirements specifications, compliance with standards legislation). The methodology developed enable to:  Modeling and simulate the functional and dysfunctional behavior of systems.  Estimate the reliability by modelling.  Achieve measures sensitivity to deduce the contribution of each component in the reliability of the system.  Capitalize the system knowledge during different phases of evaluation (planning, experimental and operational) to refine estimations of reliability. This work introduces the concept of information dependability. It interprets the information failure, as a result of the initiation and propagation of failure information through the architecture. This spread has been accompanied by constraints (sharing hardware resource and information, degraded modes of information.), which tend to influence the credibility of this information. We begin on a state of the art to show the interest of the information flow approach in a complex case study. This interest is linked to the presence of programmable part (hardware-software interaction), ...

International Journal of Advanced Computer Science and Applications(IJACSA), 8(10), 2017 ; During the last years, Wireless Sensor Networks (WSNs) have attracted considerable attention within the scientific community. The applications based on Wireless Sensor Networks, whose areas include, agriculture, military, hospitality management, etc. are growing swiftly. Yet, they are vulnerable to various security threats, like Denial Of Service (DOS) attacks. Such issues can affect and absolutely degrade the performances and cause a dysfunction of the network and its components. However, key management, authentication and secure routing protocols aren't able to offer the required security for WSNs. In fact, all they can offer is a first line of defense especially against outside attacks. Therefore, the implementation of a second line of defense, which is the Intrusion Detection System (IDS), is deemed necessary as part of an integrated approach, to secure the network against malicious and abnormal behaviors of intruders, hence the goal of this paper. This allows improving security and protecting all resources related to a WSN. Recently, different detection methods have been proposed to develop an effective intrusion detection system for WSNs. In this regard, we proposed an integral mechanism which is an hybrid Intrusion Detection approach based on anomaly, detection using support vector machine (SVM), specifications based technique, signature and clustering algorithm to decrease the consumption of resources, by reducing the amount of information forwarded. So, our aim is to protect WSN, without disturbing networks performances through a good management of their resources, especially the energy. ; http://thesai.org/Downloads/Volume8No10/Paper_35-Implementation_of_an_Hybrid_Intrusion_Detection_Mechanism.pdf

International audience ; Cloud computing is a new concept that was developed quite a lot these recent years. The number of organizations and companies adopting the cloud solutions is increasing because of many advantages found in its use (cut in setup and operating costs, scalability, flexibility….). However, this new paradigm faces some concerns that slow down its evolution and cause less infatuation from the users. The main issue here is undoubtedly the lack of security and mainly how outsourced sensible data within a cloud server can be protected? A number of solutions are being examined in order to strengthen the used models (authentication, data encryption and fragmentation before storing, Identity Access Management…), Data owners, users and Cloud Service providers are often involved. In this paper, we propose a new approach in which the provider does not participate on any level in the access management, only the owner can setup, update and verify access rights with the aim of minimizing leak risks.

International audience ; Cloud computing is a new concept that was developed quite a lot these recent years. The number of organizations and companies adopting the cloud solutions is increasing because of many advantages found in its use (cut in setup and operating costs, scalability, flexibility….). However, this new paradigm faces some concerns that slow down its evolution and cause less infatuation from the users. The main issue here is undoubtedly the lack of security and mainly how outsourced sensible data within a cloud server can be protected? A number of solutions are being examined in order to strengthen the used models (authentication, data encryption and fragmentation before storing, Identity Access Management…), Data owners, users and Cloud Service providers are often involved. In this paper, we propose a new approach in which the provider does not participate on any level in the access management, only the owner can setup, update and verify access rights with the aim of minimizing leak risks.

International audience ; Cloud computing is a new concept that was developed quite a lot these recent years. The number of organizations and companies adopting the cloud solutions is increasing because of many advantages found in its use (cut in setup and operating costs, scalability, flexibility….). However, this new paradigm faces some concerns that slow down its evolution and cause less infatuation from the users. The main issue here is undoubtedly the lack of security and mainly how outsourced sensible data within a cloud server can be protected? A number of solutions are being examined in order to strengthen the used models (authentication, data encryption and fragmentation before storing, Identity Access Management…), Data owners, users and Cloud Service providers are often involved. In this paper, we propose a new approach in which the provider does not participate on any level in the access management, only the owner can setup, update and verify access rights with the aim of minimizing leak risks.

International audience ; Cloud computing is a new concept that was developed quite a lot these recent years. The number of organizations and companies adopting the cloud solutions is increasing because of many advantages found in its use (cut in setup and operating costs, scalability, flexibility….). However, this new paradigm faces some concerns that slow down its evolution and cause less infatuation from the users. The main issue here is undoubtedly the lack of security and mainly how outsourced sensible data within a cloud server can be protected? A number of solutions are being examined in order to strengthen the used models (authentication, data encryption and fragmentation before storing, Identity Access Management…), Data owners, users and Cloud Service providers are often involved. In this paper, we propose a new approach in which the provider does not participate on any level in the access management, only the owner can setup, update and verify access rights with the aim of minimizing leak risks.