Abstract
In this paper, we propose a novel two-tier authentication scheme based on physiology. Our sensors are fused with a patient, where a physiological key is generated in a decentralized fashion. Secure aggregation and secure routing are deployed in the authentication procedure. This scheme lies on our unique secure architecture for Healthcare WSN that explores the characteristics of Healthcare WSN, departing from general purpose WSN. We conduct extensive analysis to study the effectiveness and efficiency of our scheme.