Healthcare monitoring architecture coupled with wearable sensor systems for monitoring elderly orchronic patients in their residence has emerged as a promising technique. The wearable sensor system,built into a fabric belt, consists of various medical sensors that collect a timely set of physiological healthindicators transmitted via low energy wireless communication (Zigbee) to mobile computing devices. Inthis context, Security of the Wireless Body Area Sensor Network (WBASN) in Ubiquitous healthcareapplications is a crucial problem because sensitive and personal medical information must be protectedagainst flaws and misdeed and also in order to increase user’s acceptance to these new technologies.Moving towards this direction, we analyze the data access security due to replication attacks and theproblems caused by it. We propose a secure multicast strategy that employs trust in order to evaluate thebehavior of each node, so that only trustworthy nodes are allowed to participate in communications, whilethe replicated nodes are revocated from the network.
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