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OPEN SYMMETRIC KEY keyName DECRYPTION BY decryption_mechanism
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The decryption mechanism is the same one specified when creating the key
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8: Database Security
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With the key open, we can encrypt the data by using the EncryptByKey function The EncryptByKey function has two required parameters:
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Key_GUID This is the GUID of the key used to encrypt the text This can be identified as the actual GUID, or by listing the name of the open key Clear text This is the actual text to be encrypted
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The partial syntax for the EncryptByKey function is
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EncryptByKey(Key_GUID(' keyName '), ' Data to encrypt ')
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Once the data has been encrypted, the key should be closed If not closed, it will remain open for the entire session
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Putting It All Together
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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 customer s credit cards, immediately encrypt them so that they are never stored in clear text, and then when necessary retrieve them How would you do so 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 (ie, 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 (cont)
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Last, grant 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 displaying the encrypted data
In the next exercise, we will create necessary keys to encrypt data, use them to encrypt a column of data, and then use them to view the decrypted data Exercise 84: Using 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:
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 )
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
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