An implementation of secure wireless sensor network for e-healthcare system

In wireless sensor networks (WSNs), information carried in data sensor is very important for everyone, especially for critical data such as disaster warning, location based in military, and other high-risk data. Wireless Body Area Network (WBAN) which informs data sensor of body status, such as blood pressure, electrocardiogram, air-flow of breathing, body temperature, patient position and falls, galvanic skin response, etc. as well as environment conditions such as humidity, gases, noise, etc. Such data sensor should be transferred through wireless to the data center server securely and can be easily accessed by everyone at anytime and anywhere. However, data exchange in WSNs has a big possibility to be illegally intercepted by many threats and attacks. Hence, security mechanism would be desirable to address the problem. In fact, sensor nodes usually have low power, low performance and limited resources. In this paper, we propose a security system in WSN for e-healthcare system that satisfies confidentiality, authenticity, and data integrity with consideration on low overhead of cryptographic computation. Our experimental results showed that total computation time for cryptographic is about 3.61 seconds on Waspmote ATmegal281 microcontroller 14MHz.