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Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
SQL database in Microsoft Fabric
These functions support digital signing, digital signature validation, encryption, and decryption.
Symmetric encryption and decryption
Asymmetric encryption and decryption
Signing and signature verification
Symmetric decryption, with automatic key handling
Encryption hashing
Certificate copying
See also
Functions
Encryption Hierarchy
Permissions Hierarchy (Database Engine)
CREATE CERTIFICATE (Transact-SQL)
CREATE SYMMETRIC KEY (Transact-SQL)
CREATE ASYMMETRIC KEY (Transact-SQL)
Security Catalog Views (Transact-SQL)