The growth of different network architectures to connect wireless sensors for monitoring physical environments has become an important application area. Chief issues related to such systems include: (a) the permanence of environment monitoring, (b) the mobility management of sensors, (c) the adhoc communication method, and (d) the security of responsive messages. This paper presents an ad-hoc architecture and communication and mobility schemes to offer an efficient monitoring system in an environment where targets have unpredicted motion. Moreover, it introduces a security solution. The paper concludes by presenting the simulation results in order to validate the effectiveness of the proposed schemes.