Textbook in PDF format The book is a comprehensive resource on the latest advancements in passwordless authentication, providing readers with a detailed understanding of how this technology works, its advantages, and its potential to transform the way we secure our digital lives. In today's digital age, protecting online accounts has never been more critical. Traditional password-based authentication methods are becoming increasingly vulnerable to security threats. Additionally, users are growing weary of the inconvenience of constantly having to remember and update complex, unique passwords across innumerable services. This book covers the challenges associated with traditional password-based authentication, including password fatigue, weak passwords, and the risks of password reuse. It introduces readers to passwordless authentication and its various techniques, including biometric authentication, hardware token-based authentication, email and SMS-based authentication, and more. Readers are guided through the technical aspects of implementing passwordless authentication, including the challenges and considerations involved in integrating it with existing systems and processes. The book examines the vulnerabilities of passwordless authentication and offers practical guidance on mitigating those risks while ensuring security. Additionally, it compares passwordless authentication to other authentication techniques in terms of security. It explores global trends in regulations for passwordless authentication and provides guidance on meeting those requirements. The book examines emerging trends and technologies likely to shape the evolution of passwordless authentication and their broader impact on cybersecurity. Whether the reader is a cybersecurity professional looking to implement passwordless authentication in their organization or an everyday user seeking a more secure way to protect their online accounts, this book provides a comprehensive and practical guide to the latest advancements in passwordless authentication. his book is an essential resource for anyone interested in the future of online security