Transparent Data Encryption (TDE) was introduced in SQL Server 2008, as a feature of the Enterprise Edition of that product. Finally, we will cover the process of removing TDE, should the need arise. We will also walk through an example of implementing and validating TDE using the HomeLending database. In this article we will explore the considerations of TDE that must be understood prior to its use. Overall, this is a straightforward, low-impact feature that has great security benefits the only caveat being that it requires SQL Server 2008 Enterprise Edition. However, a would-be data thief, who has obtained access to the data files through a stolen backup file, will find he or she is unable to access the data it contains. Therefore, a valid user can access the decrypted contents of the database files without any distinguishable actions, and without even being aware that the underlying data files are encrypted. This key references a key hierarchy in the MASTER database, and this dependency prevents the data files from being viewed outside their instance. The data files for a given database are encrypted using a database encryption key in the user database. TDE is distinct from other techniques in that it secures data by encrypting the physical files of the database, rather than the data itself. The experience of the car owner in possession of a fob is similar to the experience of the user attempting to gain access to a database in which Transparent Data Encryption ( TDE) has been enabled. If a person who does not possess the fob attempts to open the door of the automobile, the door remains locked, denying access into the vehicle. The fob is recognized by the security system and the door is automatically unlocked in other words, the fob holder is granted access to the vehicle without any distinguishable action required on his or her part. Of these devices, only the fob offers transparency to the owner of the vehicle. These include pushing a button on a device that transmits a radio frequency, entering a code into a key pad located beneath the driver’s side door handle, or possessing a device, called a fob, that is detected by the automobile’s security system. Keyless entry for automobiles was first introduced by American Motors Corporation in 1983 and, today, there are a variety of methods that are available that permit the user to gain access to their automobile without inserting a physical key into the door lock.

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