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6 – Transparent Data EncryptionGONOREWIND,NOUNLOAD,STATS = 10Listing 6-9: Backing up the HomeLending database after TDE is implemented.The next step is to compare the contents of the pre-TDE and post-TDE backupfiles, by opening both files up in a simple text editor such as Notepad, Wordpador Textpad. We can perform a search within the pre-TDE backup file for theplain text of a known sensitive data value. For example, we will search for thevalue of "319726 Rocky Fabien Avenue" which is contained in theBorrower_Address table in the HomeLending database.This search reveals the searched value in plain text, as shown in Figure 6-2. Inaddition, if you were to manually scan through the backup file, you would findthat the metadata of our database objects, such as tables, views, storedprocedures and user defined functions are revealed in plain text.Figure 6-2: Backup File – Unencrypted.The same search on our post-TDE backup file will result in the message boxshown in Figure 6-3, stating that it cannot find the requested value. This isbecause the entire backup file, including the metadata of our database objects,has been encrypted and no longer contains any plain text values.141
6 – Transparent Data EncryptionFigure 6-3: Search Results in Encrypted Backup File.One final test in regard to the backup file is to attempt to restore the post-TDEbackup file onto a different instance than the one in which the HomeLendingdatabase resides, using the RESTORE DATABASE command, as shown inListing 6-10.USE master;GORESTORE DATABASE HomeLendingFROM DISK ='D:\HomeLending\Backup\HomeLending_PostTDE.bak'WITH FILE = 1,NOUNLOAD,REPLACE,STATS = 10GOListing 6-10: Attempting to restore the HomeLending database.This attempt will return an error message that states that the certificate at theMaster database level, in which the HomeLending database encryption keyis protected, does not exist; therefore the attempt will fail.Msg 33111, Level 16, State 3, Line 2Cannot find server certifiate with thumbprint…Msg 3013, Level 16, State 3, Line 2RESTORE DATABASE is terminating abnormallyUsing EXECUTE ASFinally, we can perform a test to determine that the data that is containedwithin the encrypted HomeLending database files can be read by valid usersof the database, as shown in Listing 6-11. As described previously in Chapter5, we use EXECUTE AS USER to impersonate various users within the database142
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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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4 - Encryption Basics for SQL Serve
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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 172 and 173: CHAPTER 8: OBFUSCATIONHalloween is
Page 174 and 175: 8 - Obfuscation• Artificial Data
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Page 190 and 191: 9 - Honeycombing a DatabaseUse Home
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9 - Honeycombing a DatabaseUSE Mast
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9 - Honeycombing a DatabaseLog Item
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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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