Attack and Defence on PPG-Based Cybersecurity System

This thesis explores the emerging field of Photoplethysmography-based biometric authentication, addressing the limitations of traditional biometric systems and proposing innovative solutions. It introduces a generic methodology for Photoplethysmography-based authentication, assesses its application in user authentication and secure communications, and highlights its unique advantages, such as ease of acquisition and liveness detection. The thesis also proposes an efficient authentication method for virtual reality environments, and critically analyzes the vulnerabilities of Photoplethysmography-based systems, especially against remote Photoplethysmography attacks. Further, it investigates the security of Photoplethysmography signals in communication protocols and suggests an active defence strategy against remote Photoplethysmography spoofing.