Some drivers also let you implement and register a custom column master key store provider, so that you can use any key store, even if there's no built-in provider for it. Always Encrypted enabled drivers include a few built-in providers for popular key stores. Which Key Stores are Supported in Always Encrypted Enabled Client Drivers?Īlways Encrypted enabled client drivers are SQL Server client drivers that have built-in support for incorporating Always Encrypted into your client applications. Ensure that your applications are configured to connect to the centralized key store. A centralized key store usually makes key management easier because you don't need to maintain multiple copies of your column master keys on multiple machines. An example of a centralized key store is Azure Key Vault. When you provision a column master key for the first time, or when you change (rotate) the key, you need to make sure the key gets deployed to all machines hosting your application(s).Ĭentralized Key Stores - serve applications on multiple computers. When using a local key store, you need to make sure that the key store exists on each machine hosting your application, and that the computer contains the column master keys your application needs to access data protected using Always Encrypted.
An example of a local key store is Windows Certificate Store. In other words, you need to replicate the key store and key to each computer running your application. Local Key Stores - can only be used by applications on computers that contain the local key store. There are two high-level categories of key stores to consider - Local Key Stores, and Centralized Key Stores.
Master key vs skeleton key driver#
Supported key stores vary depending on which driver and version you're using. Selecting a Key Store for your Column Master KeyĪlways Encrypted supports multiple key stores for storing Always Encrypted column master keys. For a detailed overview, see Overview of Key Management for Always Encrypted. This article provides details for selecting a key store and creating column master keys for Always Encrypted. Column master keys must be stored in a trusted key store, and the keys need to be accessible to applications that need to encrypt or decrypt data, and tools for configuring Always Encrypted and managing Always Encrypted keys. Applies to: SQL Server (all supported versions) Azure SQL Database Azure SQL Managed InstanceĬolumn Master Keys are key-protecting keys used in Always Encrypted to encrypt column encryption keys.
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