Azure resource providers encryption model support

Microsoft Azure Services each support one or more of the encryptions at rest models. For some services, however, one or more of the encryption models might not be applicable. For services that support customer-managed key scenarios, they might support only a subset of the key types that Azure Key Vault supports for key encryption keys. Additionally, services might release support for these scenarios and key types at different schedules. This section describes the encryption at rest support at the time of this writing for each of the major Azure data storage services.

Azure disk encryption

Any customer using Azure Infrastructure as a Service (IaaS) features can achieve encryption at rest for their IaaS VMs and disks through Azure Disk Encryption. For more information on Azure Disk encryption, see Azure Disk Encryption for Linux VMs or Azure Disk Encryption for Windows VMs.

Azure storage

All Azure Storage services (Blob storage, Queue storage, Table storage, and Azure Files) support server-side encryption at rest; some services additionally support customer-managed keys and client-side encryption.

Azure SQL Database

Azure SQL Database currently supports encryption at rest for Microsoft-managed service side and client-side encryption scenarios.

Support for server encryption is currently provided through the SQL feature called Transparent Data Encryption. Once an Azure SQL Database customer enables TDE, keys are automatically created and managed for them. Encryption at rest can be enabled at the database and server levels. As of June 2017, Transparent Data Encryption (TDE) is enabled by default on newly created databases. Azure SQL Database supports RSA 2048-bit customer-managed keys in Azure Key Vault. For more information, see Transparent Data Encryption with Bring Your Own Key support for Azure SQL Database and Data Warehouse.

Client-side encryption of Azure SQL Database data is supported through the Always Encrypted feature. Always Encrypted uses a key that is created and stored by the client. Customers can store the master key in a Windows certificate store, Azure Key Vault, or a local Hardware Security Module. Using SQL Server Management Studio, SQL users choose what key they'd like to use to encrypt which column.


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