The Wireless Sensor Node serves as one of the crucial components needed for various wireless applications and services in the modern environment. As Wireless Sensor Networks (WSN) becomes more popular due to benefits they bring such as in smart home systems, transportation, military and etc, security issues emerge because this platform generally exposed to too many potential threats such as physical attack. Common physical attack in WSN system is the initial boot phase of the device. Currently, most wireless sensor nodes only depend on software based security to prevent attacks on the system but due to it being currently widely deployed in critical areas such as the military and in health monitoring, software-based security is no longer adept. Generally, considering security in the design of the physical sensor together with software based security will enhance the security level of the sensor node and its overall system. While majority of available sensor node left the security issues to communications level, our work focus on securing the wireless sensor node and its credential information from physical types of attack. In this paper we propose a method to enhance the security features in the sensor node utilizing ARM11 32 bit processor with on-SOC memory and TrustZone.
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