Physiological Signal Based Security
Body Area Networks (BANs) constantly interact with their physical environment with the help of sensors. Sensors collect process as well as communicate information gathered from their environment. Thus BANs are inherently cyber-physical systems. The BAN interacts with its physical world (human body) by collecting, processing, and communicating health data (vital signals, temperature, pressure) from the person. This information from the environment that is already being collected can be used to provide security to the BAN. Physiological Value based Security (PVS) uses the vital signals of the human body that is collected during health monitoring operation  to provide usable security to BAN. Properties of PVS. For PVS to succeed the scheme developed should have the following properties: Implementation of PVS using Photoplethysmogram (PPG) signals. Plethysmogram based Key Agreement protocol (PKA) uses PPG signals to provide PVS infrastructure to the BAN. It provides secure key agreement between two sensors that wish to communicate in a BAN. PKA has been divided into four basic steps as described in Figure 1: