In the current trend, Internet of Things (IoT) technology is more useful in healthcare in terms of mobile health and remote patient monitoring. IoT produces enormous data to be processed in cloud. In practice, the latency caused by cloud for processing the data leads to unacceptable losses. As an alternative method, we have proposed a system to reduce the latency caused. The health care IoT devices start emitting the data relevant to a patient. The data are then uploaded as current status of a patient from smart home or hospital to the cloud continuously. The mobile of each patient will be acting as Fog-node in which it collects the data and computes the received data and generates events for abnormal cases. When an event is triggered the cloud sends alert to doctor, ambulance and relatives based on the threshold of event occurred. All data transmission occurring in-between Cloud Server and Mobile of each patient is encrypted using One Time Pad security mechanism. The proposed encryption mechanism is a lightweight encryption compatible with IoT based system. Since it has an encryption that is yet to be cracked, we can ensure secure transmission of patient records with a higher performance than which was achieved by cloud computing.