Manage life cycle for storage account access keys

When you create a storage account, Azure generates two 512-bit storage account access keys for that account. These keys can be used to authorize access to data in your storage account via Shared Key authorization, or via SAS tokens that are signed with the shared key.

Microsoft recommends that you use Azure Key Vault to manage your access keys, and that you regularly rotate and regenerate your keys. Using Azure Key Vault makes it easy to rotate your keys without interruption to your applications. You can also manually rotate your keys.

Protect your access keys

Storage account access keys provide full access to the configuration of a storage account, as well as the data. Always be careful to protect your access keys. Use Azure Key Vault to manage and rotate your keys securely. Access to the shared key grants a user full access to a storage account’s configuration and its data. Access to shared keys should be carefully limited and monitored. Use shared access signature (SAS) tokens with limited scope of access in scenarios where Microsoft Entra ID based authorization can't be used. Avoid hard-coding access keys or saving them anywhere in plain text that is accessible to others. Rotate your keys if you believe they might have been compromised.

Microsoft recommends using Microsoft Entra ID to authorize requests against blob, queue, and table data if possible, rather than using the account keys (Shared Key authorization). Authorization with Microsoft Entra ID provides superior security and ease of use over Shared Key authorization. For Server Message Block (SMB) Azure file shares, Microsoft recommends using on-premises Active Directory Domain Services (AD DS) integration or Microsoft Entra Kerberos authentication.

To prevent users from accessing data in your storage account with Shared Key, you can disallow Shared Key authorization for the storage account. Granular access to data with least privileges necessary is recommended as a security best practice. Microsoft Entra ID based authorization should be used for scenarios that support OAuth. Kerberos or SMTP should be used for Azure Files over SMB. For Azure Files over REST, SAS tokens can be used. Shared key access should be disabled if not required to prevent its inadvertent use.

To protect an Azure Storage account with Microsoft Entra Conditional Access policies, you must disallow Shared Key authorization for the storage account.

If you have disabled shared key access and you are seeing Shared Key authorization reported in the diagnostic logs, this indicates that trusted access is being used to access storage.


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