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7 – One-Way EncryptionLater in this chapter we will take the code provided in Listing 7-6 and place itin a stored procedure, which will be used when the records are inserted andupdated.Verify the ImplementationTo verify that our hash values were successfully generated, we can executeSELECT statements that filter, based upon our newly generated columns, asshown in Listing 7-7.USE HomeLending;GODECLARE @Salt varchar(7)SET @Salt = dbo.GetHashSalt('L01');-- Returns search by full SSNSELECTIdentification_ValueFROMdbo.Borrower_IdentificationWHEREIdentification_Value_H =HASHBYTES('SHA1', @Salt + '555-20-7151');-- Returns search by last four digits of SSNSELECTIdentification_ValueFROMdbo.Borrower_IdentificationWHEREIdentification_Value_HT =HASHBYTES('SHA1', @Salt + '7151');GOListing 7-7: Testing the one-way encryption.The results of these queries, indicating successful implementation of one-wayencryption, would appear as follows:Identification_Value-------------------------------------------------------555-20-7151(1 row(s) affected)Identification_Value-------------------------------------------------------555-20-7151(1 row(s) affected)161
7 – One-Way EncryptionDrop the Unencrypted ColumnHaving successfully encrypted the contents of our Identification_Valuecolumn, captured it into the Identification_Value_H andIdentification_Value_HT columns, and verified that they are workingcorrectly; we can remove the Identification_Value column thatcontains the plain text values of our sensitive data.This is accomplished through the use of the ALTER TABLE method and theDROP COLUMN argument, as shown in Listing 7-8.USE HomeLending;GOALTER TABLE dbo.Borrower_IdentificationDROP COLUMN Identification_Value;GOListing 7-8: Dropping the plain-text column.Please note that the plain text values contained in this column will bepermanently lost with its removal. This is definitely an action in which we willwant to take pause. Perform the DROP COLUMN command only if you arecertain that you will no longer need to reference its contents. At the beginningof this process we performed a database backup which will provide us a meansof recovery if needed. If the plain text values are archived to another location ittoo will need to be protected.Creating the InterfaceThe sensitive data that is contained within the Borrower_Identificationtable is now protected with one-way encryption. Our next steps are to create theinterface through which our users can access this table.In Chapter 5, as a general policy, we denied direct access to all base tableswithin the HomeLending database using the script shown in Listing 7-9.162
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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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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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