The advancement in miniature, lightweight, low-cost, and smart physiological sensor nodes should be done by the current development in sensor nodes and power efficient integrated circuits. The sensor nodes should have the capacity of sensing, processing, controlling and communication. The applications of these sensors for health monitoring includes Wireless Personal Area Networks (WPANs) or Wireless Body Sensor Networks (WBSNs).Many works have been done for developing WBSNs as flexible, reliable, secure, real-time, and power-efficient for health monitoring. In this paper, a three stage design for mobile health application is proposed for maintaining the patient data with authentication and confidentiality by using the key sharing and management mechanism. It is highly essential if the patient is having an embarrassing disease.