Multi-dimensional Identity Construction and Continuous Authentication Methods: A Survey

In the rapidly evolving digital era, where interconnected devices like smartphones proliferate, sensitive data exchange has surged, amplifying cybersecurity risks. Therefore, a need for robust authentication to safeguard privacy and prevent unauthorized access, driving innovative solutions that enhance digital security. This survey paper focuses on the critical need for advanced authentication methods to address escalating cyber threats and the shortcomings of traditional single-factor authentication. Conventional methods, reliant on passwords or tokens, are highly susceptible to breaches and user negligence, leaving significant security vulnerabilities. This study bridges these gaps through an in-depth exploration of Continuous Authentication (CA) techniques, which utilize real-time monitoring of user behavior and biometric data to enhance security and usability. A comprehensive analysis of multi-dimensional identity factors (physiological, behavioral, and context-aware) highlights how their integration can improve reliability while respecting privacy. The study provides insights into balancing security, usability, and privacy, guiding the development of modern, user-centric authentication frameworks.