MCITP SQL Server 2005 Database Developer All-in-One Exam Guide in .NET

Creation QR Code 2d barcode in .NET MCITP SQL Server 2005 Database Developer All-in-One Exam Guide

MCITP SQL Server 2005 Database Developer All-in-One Exam Guide
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Obviously, the topics in this chapter aren t disjointed technologies They are intended to be used as part of a comprehensive security strategy Let s say you are tasked with creating a strategy designed to accept customers credit cards, immediately encrypt them so they are never stored in clear text, and then when necessary retrieve them How would you do this First create a user in the database, and grant the permissions necessary to use the certificates and keys with full access to the database objects One possibility would be to add this user to the db_owner database role For a large database, you may choose to spread the permissions among multiple accounts (that is, one user or database role to execute the stored procedure to encrypt the data, another user or role to execute the stored procedure to decrypt the data, and another user or role with full control to manage schema changes) Next, create a stored procedure (usp_InputCustomer) dedicated to accepting customer information as input parameters and storing it in the appropriate table The credit card information would be encrypted within this stored procedure Define this stored procedure with the EXECUTE AS clause identifying the user that was placed in the db_owner role The customer information could be gathered from a web page, or a phone representative could be collecting it and typing it into a Windows program Depending on how the data is collected and entered, you need to grant Execute permission to a user or role on the usp_InputCustomer stored procedure Since the stored procedure was defined with the EXECUTE AS clause, no additional permissions are needed on the underlying tables, certificates, or keys Now create another stored procedure that can be used during a purchasing phase This stored procedure would accept the customer ID as the input and then output the unencrypted credit card information that can be used to purchase merchandise Again, define the stored procedure with the EXECUTE AS permission using the User account that is a member of the db_owner role Lastly, grant the Execute permission on the purchasing stored-procedure to the appropriate user or role that needs it during the purchasing phase If this process is done via the Web, at no time will any database users ever see the unencrypted credit card information The customer enters it into a page, and it s immediately encrypted before being stored If other customer information is needed, VIEWs can be created with the appropriate permissions to allow access to the specific columns needed, but not those displaying the encrypted data
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8: Security
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Exercise 88: Use Encryption 1 Open SSMS and create a New Query window 2 Use the following script to create a new database named 8 and a table named Customers in the database:
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USE Master; GO CREATE DATABASE 8; GO USE 8; Go CREATE TABLE dboCustomer ( CustomerID int IDENTITY(1,1) NOT NULL, LastName varchar(50) NOT NULL, FirstName varchar(50) NOT NULL, CreditCardNumber nvarchar(20) NULL, EncryptedCreditCardNumber varbinary(128) NULL, CONSTRAINT [PK_Customer_CustomerID] PRIMARY KEY CLUSTERED ( CustomerID ) );
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CAUTION Encrypted data needs to be stored in a varbinary column If you try to store it in a varchar column similar to the source data, you won t be able to decrypt it 3 Use the following script to add four lines of data to the Customer table and then view them:
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INSERT INTO Customer VALUES(' Jetson ', ' George ', ' 1234-5678-1234 ',NULL); INSERT INTO Customer VALUES('Jetson', 'Elroy', '9876-5432-9876',NULL); INSERT INTO Customer VALUES('Simpson', 'Homer', '1029-3847-5765',NULL); INSERT INTO Customer VALUES('Simpson', 'Bart', '5678-1234-5678',NULL); SELECT * FROM Customer;
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4 Create the keys and certificate necessary for the encryption: a Create a database master key with the following code:
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CREATE MASTER KEY ENCRYPTION BY PASSWORD = 'P@ssw0rd'
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NOTE If this is the first time a database master key is being created on the server, this command will also automatically create a service master key This will be transparent b Create a certificate that will be used to encrypt the symmetric key Use the following command Be patient, because it may take a moment
CREATE CERTIFICATE CreditCardCert WITH SUBJECT = 'Customer Credit Card Numbers'
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