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Learn to implement Multi-Factor Authentication (MFA) in Spring Boot 4 applications using the new native MFA support introduced in Spring Security 7. Build a complete example from scratch, starting with a new Spring Boot 4 project and implementing password authentication combined with one-time tokens. Discover how Spring Security's elegant solution uses factor granted authorities to track verified authentication methods and intelligently redirects users to complete missing factors. Explore MFA fundamentals and OWASP factor categories including something you know, have, or are, then master the @EnableMultiFactorAuthentication annotation and form login setup with one-time token authentication. Understand how Spring Security's smart redirect system handles missing factors, create a custom token service for 5-digit PIN codes, and utilize trace logging for debugging Spring Security implementations.
