"Identity Authentication and Authorization" delves into the critical role of identity management in today's digital landscape, exploring the technologies, frameworks, and best practices that secure user access across platforms. From foundational concepts like multi-factor authentication and single sign-on to advanced topics such as decentralized identity, zero trust architecture, and AI-driven security, this book provides a comprehensive guide for navigating the evolving challenges of authentication and authorization. Ideal for IT professionals, cybersecurity experts, and business leaders, it offers practical insights into building robust, scalable, and user-centric identity systems that balance security with seamless digital experiences.