This article demonstrates how to build secure B2C applications using Amazon Cognito for authentication and Amazon Verified Permissions with Cedar policies for fine-grained authorization.

• Amazon Cognito handles user authentication with JWTs, password policies, and session management
• Amazon Verified Permissions uses Cedar policy engine for centralized access control decisions
• Cedar policies define who can perform what actions on which resources under specific conditions
• Resource ownership, role-based access, hierarchical permissions, and admin overrides are key patterns
• Forbid policies take precedence; if any forbid policy matches, access is denied immediately
• Sample academic system demonstrates student, faculty, TA, department head, and admin roles
• Implementation requires layered security, least privilege principles, input validation, and monitoring
• AWS provides sample code repository and deployment scripts for quick setup

This architecture provides enterprise-grade security with minimal development effort by separating authentication, authorization, application logic, and enforcement boundaries.