Transparent Data Encryption in SQL Server | TDE in SQL Server | Encryption in SQL | Ms SQL

Transparent Data Encryption (TDE) is a special case of encryption using a symmetric key. TDE encrypts entire database using a symmetric key called the database encryption key – DEK. TDE does real-time I/O encryption and decryption of data and log files. This encryption is known as encrypting data at rest. Introduced with SQL server 2008. TDE isn't available for system databases. It can't be used to encrypt master, model, or msdb. However, tempdb is automatically encrypted when a user database enabled TDE, but can't be encrypted directly. TDE doesn't provide encryption across communication channels. --Video link on how to encrypt a database backup https://youtu.be/YFA0eWUmj7s?si=97XhUehg-Hr9bJzl ----SQL Script used in this video---- -- Encrypt a user database --1.Create a Master key use master CREATE MASTER KEY ENCRYPTION BY PASSWORD = 'abc@123'; --2.Create a Certificate CREATE CERTIFICATE democert WITH SUBJECT = 'my demo cert subject'; --3.Create a Database encryption key use demo CREATE DATABASE ENCRYPTION KEY WITH ALGORITHM = AES_256 ENCRYPTION BY SERVER CERTIFICATE democert --4.Backup the certificate and key use master BACKUP CERTIFICATE democert TO FILE = 'F:\dbbackups\democert_cert.cer' WITH PRIVATE KEY (FILE = 'F:\dbbackups\democert_key.key' , ENCRYPTION BY PASSWORD = 'abc@1123') --5.Set encryption ON for the database ALTER DATABASE demo set ENCRYPTION on select name, database_id, is_encrypted from sys.databases -------------------------------------------------------------------------- -- To restore a encrypted database -- restore database demo from disk = 'F:\dbbackups\demo2.bak' -- 1. Create a Master key use master CREATE MASTER KEY ENCRYPTION BY PASSWORD = 'xyz@123'; --2.Create a Certificate using the backup of source certificate & key CREATE CERTIFICATE democert_pitr FROM FILE = 'F:\dbbackups\democert_cert.cer' WITH PRIVATE KEY (FILE = 'F:\dbbackups\democert_key.key',DECRYPTION BY PASSWORD = 'abc@1123') ------------------------------------------------------------------------