![]() Once TDE is enabled for a user database, then the tempdb database in the instance will also be encrypted, as the database may contain the temporary user objects, internal objects, and row versions which can expose the sensitive data. The encryption is transparent to any user or application querying the database. TDE performs this real-time I/O encryption and decryption of both the data and log files to protect data at rest. ![]() When data is inserted or updated, the SQL Server database encrypts the entire block written to disk. When data is read from disk, SQL Server decrypts the entire block, making the data visible to the database engine. This level will explain how TDE works and cover the steps to implement TDE using certificates and a Database Master Key. TDE is available with SQL Server, Azure SQL Database, and Azure Synapse Analytics (SQL DW) data files. Using this feature, the ‘data at rest’ in the physical files for the database, are protected from unauthorized access if the files are copied, or the physical media is stolen. Transparent Data Encryption (TDE) is one of the key security features available in SQL Server from SQL Server 2008 onwards. ![]()
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