Mawloud OMAR

In wireless sensor and actuator networks (WSANs), whenever an event occurs in the physical world, sensors gather this information and forward it to actuators which are responsible for taking prompt decisions and react accordingly. To ensure an efficient action, an anycast routing mechanism is trivial, a sensor node wishes to report event information to any actuators in the network and one of them is selected to react in the area of interest. In this paper, we propose a multi-actuators based anycast routing protocol for wireless sensor and actuator networks which guarantees a minimum communication delay and consumed energy. We perform an overall evaluation of our proposed approach through simulations. The obtained results show out performance of our approach while providing effective gain in terms of communication delay and consumed energy.

The proliferation of network technologies (wired, cellular, ad-hoc, etc.) leads to many different network archi- tectures. These different architectures cohabitate to provide services and contents to end customers. In order to secure services in such mixed networks, it is necessary to rely on a homogeneous trust model. The trust model must define trust relationships between the mixed architecture actors, provide elementary ingredients to secure top level services, and guarantee the security service availability. In this paper, we propose a trust infrastructure for mixed networks architectures. The model uses two particular certification authorities, which ensure X509v3 cer- tificates management: the central certification authorities (CCA) are tied to the portions of the network having a pre-existent communication infrastructure (such as wired networks, cellular networks, etc.), and mobile certification authorities (MCA) which are on the ad-hoc portion of the network. The MCA servers emulate the certification authority role using a (k,n) threshold cryptography scheme, and the CCA servers delegate the role of certification to the MCA servers by using a (t,m) scheme of threshold cryptography. This solution is decentralized and partially distributed, supports the nodes mobility and the failure of, up to n−k, among n MCA servers. The simulation results and the performance evaluation prove the adequacy of this solution to mixed networks architectures.