What is the best way to store sensitive data securely in Azure?

Using Azure Key Vault is the most effective method for securely storing sensitive data in Azure. Key Vault is specifically designed to safeguard cryptographic keys, secrets, and certificates, providing a secure central repository for sensitive information. It enables developers and administrators to manage secrets securely, including passwords, API keys, and cryptographic keys, while ensuring compliance with security policies and standards.

Key Vault provides several key features that enhance security, such as integration with Azure Active Directory for authentication, role-based access control to manage permissions, and support for secure access from applications. It allows for logging and monitoring of access requests, ensuring accountability and traceability.

In contrast, while Azure Storage can store sensitive data, it does not provide the same level of security and management features for sensitive content as Key Vault. Azure Firewall and Azure Active Directory contribute to security but do not specifically focus on storing sensitive data. Firewall is designed for network security, monitoring, and regulation of incoming and outgoing network traffic, while Azure Active Directory manages identity and access; neither addresses the secure storage of sensitive information directly.

Thus, utilizing Azure Key Vault is the best practice for managing and securing sensitive data within Azure.