Since Wireless and mobile networks have become increasingly heterogeneous and particularly dynamic, multiple security requirements must be addressed in a flexible and dynamic manner to cope with runtime changing context. Therefore, a generic security adaptation reference monitor must be developed to deal with extremely dynamic security conditions and also performances. In this paper, we present our Security Adaptation Reference Monitor (SARM) for wireless environments. SARM is based on an autonomic computing security looped system, which fine-tunes security means based on the monitoring of the context including the user environment and energy consumption aspects. We evaluate SARM in the context of proximity based wireless network through a simulation tool in the case of Geneva hotspots locations. The results show that SARM is efficient in terms of security, overall network utilization and power consumption.