![]() ![]() Although Always Encrypted doesn't provide complete isolation of data from cloud administrators, as both the data and keys are exposed to cloud administrators of the platform hosting the client tier, the customer still benefits from reducing the security attack surface area (the data is always encrypted in the database). Client and Data in AzureĪ customer has a client application, hosted in Microsoft Azure (for example, in a worker role or a web role), which operates on sensitive data stored in a database hosted in Azure (SQL Database or SQL Server running in a virtual machine on Microsoft Azure). The customer uses Always Encrypted and stores Always Encrypted keys in a trusted key store hosted on-premises, to ensure Microsoft cloud administrators have no access to sensitive data. The application operates on sensitive data stored in a database hosted in Azure (SQL Database or SQL Server running in a virtual machine on Microsoft Azure). Client on-premises with data in AzureĪ customer has an on-premises client application at their business location. SQL Server administrators have no access to the keys and, therefore, are unable to decrypt sensitive data stored in SQL Server. The customer stores plaintext values of Always Encrypted keys in a trusted key store, which the client application can access. ![]() ![]() In order to protect sensitive data stored in SQL Server, the customer uses Always Encrypted to ensure the separation of duties between database administrators and application administrators. The customer wants to hire an external vendor to administer SQL Server. Typical Scenarios Client and data on-premisesĪ customer has a client application and SQL Server both running on-premises, at their business location. (Prior to SQL Server 2016 (13.x) SP1, Always Encrypted was limited to the Enterprise Edition.) For a Channel 9 presentation that includes Always Encrypted, see Keeping Sensitive Data Secure with Always Encrypted. Similarly, the driver transparently decrypts data, stored in encrypted database columns, contained in query results.Īlways Encrypted is available in all editions of Azure SQL Database, starting with SQL Server 2016 (13.x) and all service tiers of SQL Database. The driver encrypts the data in sensitive columns before passing the data to the Database Engine, and automatically rewrites queries so that the semantics to the application are preserved. An Always Encrypted-enabled driver installed on the client computer achieves this by automatically encrypting and decrypting sensitive data in the client application. See Always Encrypted with secure enclaves.Īlways Encrypted makes encryption transparent to applications. In SQL Server 2019 (15.x), secure enclaves substantially extend confidential computing capabilities of Always Encrypted with pattern matching, other comparison operators and in-place encryption. See Selecting Deterministic or Randomized Encryption. In SQL Server 2016 (13.x), SQL Server 2017 (14.x) and in Azure SQL Database, Always Encrypted supports equality comparison via deterministic encryption. This allows organizations to store their data in Azure, and enable delegation of on-premises database administration to third parties, or to reduce security clearance requirements for their own DBA staff.Īlways Encrypted provides confidential computing capabilities by enabling the Database Engine to process some queries on encrypted data, while preserving the confidentiality of the data and providing the above security benefits. By ensuring on-premises database administrators, cloud database operators, or other high-privileged unauthorized users, can't access the encrypted data, Always Encrypted enables customers to confidently store sensitive data outside of their direct control. As a result, Always Encrypted provides a separation between those who own the data and can view it, and those who manage the data but should have no access. Always Encrypted allows clients to encrypt sensitive data inside client applications and never reveal the encryption keys to the Database Engine (SQL Database or SQL Server). social security numbers), stored in Azure SQL Database or SQL Server databases. Always Encrypted is a feature designed to protect sensitive data, such as credit card numbers or national identification numbers (for example, U.S. ![]()
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