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6 – Transparent Data Encryptionand the Master database certificate private key, prior to recovering thedatabase backup file.The database encryption key that is created in the user database, in which TDEhas been implemented, is included in the standard database backup. It is storedin the boot record of the database file so that it can be accessed and used todecrypt the user database.When the service master key and database master key are backed up, it isrecommended to store their backup files in a separate location from thedatabase files. This separation will ensure continued protection of the encrypteddata in the event that the database backup media is stolen or compromised.TDE and ReplicationIf the TDE-enabled database is part of a replication setup, the subscribingdatabase must also have TDE implemented. The data that is traveling betweenthe databases will be in plain text and is vulnerable to unauthorized disclosure.A method of encrypting connections, such as secure socket layers (SSL) orInternet protocol security (IPSec), is recommended.TDE and FileStream DataThe FILESTREAM data type stores large unstructured objects, such asdocuments and images, in an integrated physical file that is separate from thedatabase file. When TDE is implemented on a user database that containsFILESTREAM data, the filestream files remain unencrypted.Implementing TDEIn this section, we will implement TDE using the HomeLending database.Our TDE implementation, in comparison to cell-level encryption, will be verysimple. There are no modifications to the schema required, there are nopermissions that need to be granted to database users and roles in order to useTDE, and there are no additional database objects that must be created toperform the encryption and decryption methods.On the other hand, the person performing the implementation of TDE doesrequire specific permissions; namely CONTROL permissions on the Masterand HomeLending databases. It is recommended to perform this process whilethe database is not in use by other users.133
6 – Transparent Data EncryptionBackup before ProceedingIt is a general best practice to backup a database prior to making modifications.However, it is especially important when implementing TDE, in order toensure that, should the TDE implementation need to be reversed, you cancleanly recover the database in its original form.In addition, by performing a database backup, a new checkpoint will beestablished in the transaction log. The creation of a checkpoint truncates allinactive items in your transaction log prior to the new checkpoint. This willensure that your transaction log is free from unencrypted items, prior to theTDE implementation. Listing 6-1 shows the backup command for theHomeLending database.USE HomeLending;GOBACKUP DATABASE HomeLendingTO DISK = 'D:\HomeLending\Backup\HomeLending.bak'WITH NOFORMAT,INIT,NAME = 'HomeLending-Full Database Backup',SKIP,NOREWIND,NOUNLOAD,STATS = 10GOListing 6-1: Backing up the HomeLending database, prior to TDE.With the backup successfully completed, we can begin the process ofimplementing TDE.The Master DatabaseOur first step is to create a database master key for our Master database, usingthe CREATE MASTER KEY method, as shown in Listing 6-2.USE master;GOCREATE MASTER KEYENCRYPTION BY PASSWORD = 'MyStr0ngP@ssw0rd2009';GOListing 6-2: Creating the database master key in the Master database.134
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High Performance SQL ServerProtecti
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Table of ContentsAbout the Author .
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Protection via Normalization ......
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Views and Stored Procedures .......
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Numeric Variance ..................
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ACKNOWLEDGEMENTSBooks are not writt
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IntroductionIn all cases, the conse
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Introduction"lost key" displaced by
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CHAPTER 1: UNDERSTANDINGSENSITIVE D
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1 - Understanding Sensitive DataSen
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Page 86 and 87: 4 - Encryption Basics for SQL Serve
Page 102 and 103: 5 - Cell-Level Encryptionthe encryp
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Page 148 and 149: CHAPTER 7: ONE-WAYENCRYPTIONAs a ch
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Page 156 and 157: 7 - One-Way EncryptionReducing Vuln
Page 158 and 159: 7 - One-Way EncryptionUse HomeLendi
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APPENDIX A: VIEWS ANDFUNCTIONS REFE
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APPENDIX B: THE HOMELENDINGDATABASE
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Appendix B - The HomeLending databa
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About Red GateYou know those annoyi
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