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Appendix A – Views and Functions ReferenceVerifySignedByCertThis function determines if the encrypted data has changed since it wasdigitally signed. The returned value is either a 1, which indicates that the datahas not changed, or 0 which indicates that the data has changed. This functionis often used in conjunction with the DecryptByCert function.Successful digital signature verification requires the user to have VIEWDEFINITION permissions on the certificate that was used to generate thedigital signature.USE HomeLending;GOSELECTVerifySignedByCert(Cert_ID('MySelfSignedCert'),Convert(nvarchar(max),DecryptByCert(Cert_ID('MySelfSignedCert'),Identification_Value,N'MyStr0ngP@ssword2009')),N'MyStr0ngP@ssword2009')FROMdbo.Borrower_IdentificationWHEREBorrower_ID = 1;GOListing A-27: Syntax of VerifySignedByCert.String Manipulation Function ReferenceAll of the following system functions provide support for the ability tomanipulate strings of characters that is available in SQL Server 2005 as well asSQL Server 2008:ASCII and CHARThe ASCII and CHAR system functions provide the conversion functionalitybetween character values and ASCII code values. These system functions are221
Appendix A – Views and Functions Referencevaluable when iterating through characters, mathematically determiningcharacters and randomly deriving characters.The American Standard Code for Information Interchange (ASCII) is a codingscheme that is used by computers. The ASCII codes range from 0 to 255. TheASCII codes for the standard, upper case, English alphabet ranges from 65 (A)to 90 (Z). The ASCII codes for the standard, lower case, English alphabetranges from 97 (a) to 122 (z).The ASCII system function returns the ASCII code value of a given character.The argument to this function is the character to which the ASCII code isrequested. For example, passing the value of "A" will return the value of 65.The CHAR system function returns the character of a given ASCII value. Theargument to this function is the ASCII code to which the character value isrequested. For example, passing the value of 65 will return the value of "A".--Returns "65"SELECT ASCII('A');GO--Returns "A"SELECT CHAR(65);GOListing A-28: The ASCII and CHAR functions.LEFT, RIGHT and SUBSTRINGThe LEFT, RIGHT and SUBSTRING system functions provide the functionalityof obtaining a portion of a value. These system functions are valuable forconcatenating a portion of a value to another string during masking processes.The LEFT system function returns a portion of the value passed, based upon adefined number of characters from its beginning, or left most character. Thevalue returned is either a varchar (for non-unicode values) or nvarchar (forunicode values) data type.The RIGHT system function returns a portion of the value passed, based upon adefined number of characters from its ending, or right most character. Thevalue returned is either a varchar (for non-unicode values) or nvarchar (forunicode values) data type.The arguments for the LEFT and RIGHT system functions are:222
Page 1:
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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1 - Understanding Sensitive DataAcc
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1 - Understanding Sensitive DataThi
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1 - Understanding Sensitive DataThe
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1 - Understanding Sensitive Datathe
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CHAPTER 2: DATACLASSIFICATION AND R
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2 - Data Classification and Rolespr
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3 - Schema Architecture StrategiesF
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4 - Encryption Basics for SQL Serve
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5 - Cell-Level Encryptionthe encryp
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5 - Cell-Level EncryptionSearching
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5 - Cell-Level EncryptionPreparing
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5 - Cell-Level EncryptionUSE HomeLe
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5 - Cell-Level Encryptionself-signe
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5 - Cell-Level Encryptionwithin SQL
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5 - Cell-Level EncryptionTesting th
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5 - Cell-Level Encryptioncolumn. Cu
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5 - Cell-Level EncryptionFROMdbo.Bo
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5 - Cell-Level Encryptioncolumn con
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5 - Cell-Level Encryptionthat is a
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5 - Cell-Level EncryptionBEGIN TRY-
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5 - Cell-Level Encryption);)@Identi
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5 - Cell-Level Encryption• The sc
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6 - Transparent Data EncryptionHow
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6 - Transparent Data EncryptionCons
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6 - Transparent Data Encryptionand
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6 - Transparent Data EncryptionNoti
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6 - Transparent Data EncryptionGONO
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6 - Transparent Data Encryptionand
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6 - Transparent Data EncryptionUSE
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CHAPTER 7: ONE-WAYENCRYPTIONAs a ch
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7 - One-Way EncryptionBenefits and
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7 - One-Way Encryption• A match i
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7 - One-Way EncryptionPlain TextEnd
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7 - One-Way EncryptionReducing Vuln
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7 - One-Way EncryptionUse HomeLendi
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7 - One-Way EncryptionEXEC sp_addex
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7 - One-Way EncryptionLater in this
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7 - One-Way EncryptionUSE HomeLendi
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7 - One-Way EncryptionWHEREBorrower
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7 - One-Way Encryption-- Return Sea
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7 - One-Way EncryptionEXECUTE AS US
Page 172 and 173: CHAPTER 8: OBFUSCATIONHalloween is
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Page 190 and 191: 9 - Honeycombing a DatabaseUse Home
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Page 202 and 203: 10 - Layering SolutionsDesign for P
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Page 208 and 209: APPENDIX A: VIEWS ANDFUNCTIONS REFE
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Page 228 and 229: APPENDIX B: THE HOMELENDINGDATABASE
Page 230 and 231: Appendix B - The HomeLending databa
Page 232: About Red GateYou know those annoyi
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