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5 – Cell-Level Encryption• The schema design that we implemented that segregated our sensitivedata from data of lesser sensitivity allowed us to create views andstored procedures that manage functionality at a very granular level.• Through our understanding of the key hierarchy and complexities ofencryption key algorithms, we were able to implement a verymanageable, seamless and efficient solution for executingcryptographic functions.Now let's explore how encryption can provide protection to the entire databasewith the Transparent Data Encryption (TDE) feature of SQL Server 2008.127
CHAPTER 6: TRANSPARENT DATAENCRYPTIONKeyless entry for automobiles was first introduced by American MotorsCorporation in 1983 and, today, there are a variety of methods that areavailable that permit the user to gain access to their automobile withoutinserting a physical key into the door lock. These include pushing a button on adevice that transmits a radio frequency, entering a code into a key pad locatedbeneath the driver's side door handle, or possessing a device, called a fob, thatis detected by the automobile's security system.Of these devices, only the fob offers transparency to the owner of the vehicle.The fob is recognized by the security system and the door is automaticallyunlocked; in other words, the fob holder is granted access to the vehiclewithout any distinguishable action required on his or her part. If a person whodoes not possess the fob attempts to open the door of the automobile, the doorremains locked, denying access into the vehicle.The experience of the car owner in possession of a fob is similar to theexperience of the user attempting to gain access to a database in whichTransparent Data Encryption (TDE) has been enabled. TDE is distinct fromother techniques discussed in this book in that it secures data by encrypting thephysical files of the database, rather than the data itself. The data files for agiven database are encrypted using a database encryption key in the userdatabase. This key references a key hierarchy in the Master database, and thisdependency prevents the data files from being viewed outside their instance.Therefore, a valid user can access the decrypted contents of the database fileswithout any distinguishable actions, and without even being aware that theunderlying data files are encrypted. However, a would-be data thief, who hasobtained access to the data files through a stolen backup file, will find he or sheis unable to access the data it contains. Overall, this is a straightforward, lowimpactfeature that has great security benefits; the only caveat being that itrequires SQL Server 2008 Enterprise Edition.In this chapter we will explore the considerations of TDE that must beunderstood prior to its use. We will also walk through an example ofimplementing and validating TDE using the HomeLending database. Finally,we will cover the process of removing TDE, should the need arise.128
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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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CHAPTER 2: DATACLASSIFICATION AND R
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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 172 and 173: CHAPTER 8: OBFUSCATIONHalloween is
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8 - ObfuscationASSELECTdbo.Characte
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8 - ObfuscationArtificial Data Gene
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9 - Honeycombing a DatabaseUse Home
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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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