Transparent Data Encryption for SQL Server Always

This article explores Transparent Data Encryption for SQL Server Always On Availability Groups. In the previous articles of SQL Server Always On series, we explored the following topics so far.

In this 15th article of SQL Server Always On Availability Groups series, we will cover Transparent Data Encryption (TDE) for AG databases.

Introduction

In the previous articles of SQL Server Always On series, we explored the following topics so far.

• Build virtual servers using Oracle VirtualBox
• We configured domain controller, active directory and domain name service (DNS)
• Deployed SQL Server 2019 Availability groups
• Domain-independent AG in Windows Server 2016
• We configured distributed availability groups for the availability group in independent clusters

Suppose, In specific requirements, you might want to protect sensitive data for compliance and security purposes. SQL Server provides *Transparent Data Encryption(TDE) *for encrypting the physical files. In this article, we will explore TDE for a SQL Server Always On Availability Group.

Overview of Transparent Data Encryption (TDE)

The objective of implementing TDE is to secure the data and log files for a SQL database. Suppose you have sensitive customer data in your database. Someone might copy your database files and easily access critical information. This encryption process does not require any changes from the application end. It encrypts the files at the page level before writing the page in the disk. It decrypts the files once a user tries to access a page. Once we implement TDE, we cannot restore or attach a database without an appropriate certificate and key.

The high-level steps for a TDE are as below.

TDE is not straightforward for an availability group database. In the next section, we explore the steps in a two-node SQL Server Always On Availability Group.In this 15th article of SQL Server Always On Availability Groups series, we will cover Transparent Data Encryption (TDE) for AG databases.

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