Blob Storage Authentication Decision Tree

Securing access to Blob Storage requires choosing the right authentication method based on the scope and lifetime of the permissions needed. Storage account keys grant full administrative access to all data within a storage account, which means they must be rotated regularly and stored securely to prevent unauthorized exposure. To grant limited access, a Shared Access Signature (SAS) offers a time-bound and permission-restricted token for specific containers or blobs without exposing the primary keys. For the most secure and manageable approach, Azure AD authentication integrates with Microsoft Entra ID to eliminate the need for hardcoded credentials entirely.