This page provides links to help you locate the information that you need about Security and Protection in the SQL Server Database Engine.
Securing SQL Server
Principals (Database Engine)
Server-Level Roles
Database-Level Roles
Credentials (Database Engine)
Securables
Choose an Authentication Mode
Surface Area Configuration
TRUSTWORTHY Database Property
Password Policy
Strong Passwords
SQL Server Encryption
SQL Server Certificates and Asymmetric Keys
SQL Server Audit (Database Engine)
Database Engine Features and Tasks