AI-Generated Backend Security Review

I need a comprehensive security review of a backend system, which was generated using AI. The backend serves a web application and I need to ensure it is secure.

Key areas to focus on:
- Authentication mechanisms
- Data encryption
- Access control

Ideal Skills and Experience:
- Strong background in web application security
- Expertise in authentication protocols and data encryption techniques
- Experience with access control measures

Looking for detailed insights and recommendations to fortify the backend security.