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6 – Transparent Data EncryptionUSE master;GORESTORE DATABASE HomeLendingFROM DISK = 'D:\HomeLending\Backup\HomeLending.bak'WITH FILE = 1,NOUNLOAD,REPLACE,STATS = 10;GODROP CERTIFICATE MasterCert;GODROP MASTER KEY;GO-- Restart Instance Though SQL Server Management Studio:-- Right-Click instance and click on "Restart" option.Listing 6-12: Reversing TDE when no transactions have occurred.If the request to reverse the implementation of TDE comes after transactionshave occurred, or a copy of the pre-TDE backup file is no longer available, thefollowing steps can be performed:1. Alter the HomeLending database to have the ENCRYPTION option setto the value of OFF.2. Wait until the decryption process is complete. Use thesys.dm_database_encryption_keys DMV to determine itsstatus. A value of "1" returned in the encryption_status columnindicates that the decryption is complete.3. Drop the database encryption key for the HomeLending database.4. Restart the instance in which the HomeLending database resides. Ifthere are not any other user databases on the instance that have TDEimplemented, this action will force the recreation of the TempDBdatabase in an unencrypted format.Listing 6-13 shows the code to implement these steps.USE HomeLending;GOALTER DATABASE HomeLendingSET ENCRYPTION OFF;GO145
6 – Transparent Data Encryption-- Before proceeding, wait until the decryption process iscomplete.-- Use the sys.dm_database_encryption_keys dmv to determinethis.DROP DATABASE ENCRYPTION KEY;GO-- Restart Instance Though SQL Server Management Studio:-- Right-Click instance and click on "Restart" option.Listing 6-13: Reversing TDE after transactions have occurred.We will need to keep the certificate and database master key that was setup inthe Master database, since there will remain some dependencies upon thesekeys that affect the recoverability of the database.It is recommended to perform either of these removal options while thedatabase is not in use by other users. In addition, it is always recommended thata backup be made of the database, the database master key and certificate priorto reversing TDE.SummaryThrough this demonstration we have successfully implemented TDE for theHomeLending database and validated that it is enabled. In addition, the stepsto reverse TDE have been provided in the event that it is requested.While TDE does not offer the granularity of protection that cell-levelencryption offers, it does provide a level of protection that cannot be achievedthrough cell-level encryption. This feature provides a means to renderunreadable the plain text that would otherwise be disclosed in the databasebackup files.Thanks to the encryption key hierarchy that is external to the database,additional protection is offered by restricting restoration of the encrypteddatabase to the instance from which the backup files were created.Implementing TDE in conjunction with cell-level encryption provides a layeredapproach to data security, which enhances its effectiveness. Another option forprotecting sensitive data that is available is one-way encryption, also referred toas hashing. One-way encryption can be applied alongside TDE, cell-levelencryption and other obfuscation methods. One-way encryption is the topic ofthe next chapter.146
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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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Key_ID ............................
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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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1 - Understanding Sensitive Datatyp
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1 - Understanding Sensitive DataFor
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CHAPTER 2: DATACLASSIFICATION AND R
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2 - Data Classification and Rolespr
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4 - Encryption Basics for SQL Serve
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Page 102 and 103: 5 - Cell-Level Encryptionthe encryp
Page 104 and 105: 5 - Cell-Level EncryptionSearching
Page 106 and 107: 5 - Cell-Level EncryptionPreparing
Page 108 and 109: 5 - Cell-Level EncryptionUSE HomeLe
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Page 112 and 113: 5 - Cell-Level Encryptionwithin SQL
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Page 116 and 117: 5 - Cell-Level Encryptioncolumn. Cu
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Page 124 and 125: 5 - Cell-Level EncryptionBEGIN TRY-
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Page 130 and 131: 6 - Transparent Data EncryptionHow
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Page 136 and 137: 6 - Transparent Data EncryptionNoti
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Page 148 and 149: CHAPTER 7: ONE-WAYENCRYPTIONAs a ch
Page 150 and 151: 7 - One-Way EncryptionBenefits and
Page 152 and 153: 7 - One-Way Encryption• A match i
Page 154 and 155: 7 - One-Way EncryptionPlain TextEnd
Page 156 and 157: 7 - One-Way EncryptionReducing Vuln
Page 158 and 159: 7 - One-Way EncryptionUse HomeLendi
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Page 164 and 165: 7 - One-Way EncryptionUSE HomeLendi
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Page 170 and 171: 7 - One-Way EncryptionEXECUTE AS US
Page 172 and 173: CHAPTER 8: OBFUSCATIONHalloween is
Page 174 and 175: 8 - Obfuscation• Artificial Data
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Page 178 and 179: 8 - ObfuscationRepeating Character
Page 180 and 181: 8 - ObfuscationASSELECTdbo.Characte
Page 182 and 183: 8 - ObfuscationGO181
Page 184 and 185: 8 - ObfuscationSET Identification_V
Page 186 and 187: 8 - ObfuscationThe Purpose_Type_ID
Page 188 and 189: 8 - ObfuscationArtificial Data Gene
Page 190 and 191: 9 - Honeycombing a DatabaseUse Home
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9 - Honeycombing a Databaseto 127.
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9 - Honeycombing a DatabaseAvoid SQ
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10 - Layering SolutionsDesign for P
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10 - Layering SolutionsObfuscationU
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10 - Layering SolutionsThe completi
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APPENDIX A: VIEWS ANDFUNCTIONS REFE
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Appendix A - Views and Functions Re
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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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