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While cell-level encryption is a valuable enhancement, it requires changes to both applications and database schema to work. Most notably, the columns chosen for encryption have to be changed to the varbinary data type, and encrypted data is read and written with functions, requiring changes to application code, stored procedures, or both. As a result, cell-level encryption in SQL Server 2005 is typically used in limited situations and for specific data, such as credit card details or passwords. What s missing is a way of encrypting everything without requiring any database schema or application changes. Enter SQL Server 2008 and Transparent Data Encryption.

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Transparent Data Encryption (TDE) allows us to encrypt the entire database without requiring any changes to the structure of the database or the applications that access it. It protects the database in situations where someone breaches physical and login security and obtains access to the .mdf (data) files or .bak (backup) files. Without TDE or another third-party encryption solution, the files could be taken offsite and attached or restored. Later in this section we ll look at some of the restrictions of TDE that may limit its usefulness in certain situations. For the moment, though, let s take a look at implementing TDE with T-SQL scripts. ENCRYPTING A DATABASE The first step in implementing TDE is in creating a master key. Intended to protect the private keys of certificates and other keys, the master key is created as a symmetric key using the Triple DES algorithm along with a password supplied by the user creating it:

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-- Create a Master Key USE MASTER GO CREATE MASTER KEY ENCRYPTION BY PASSWORD = 'jGKhhg6647##tR'; GO

Next, we create a certificate, used to protect the database encryption key, which we ll create shortly:

-- Create a Certificate USE MASTER GO CREATE CERTIFICATE tdeCertificate WITH SUBJECT = 'TDE Certificate'; GO

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At this point, it s crucial that we back up the certificate. When a TDE-encrypted database is backed up, the backup itself is encrypted. If we want to restore an encrypted database to another server, the certificate used to encrypt the database needs to be loaded to the other server to enable the database to be restored. Further, should we suffer a catastrophic server failure, the newly installed server will also require the certificate in order to restore the database.

Numerous publications are available to those interested in consulting as a profession Consulting firms and independent consultants in the United States and Canada are listed in the Consultants and Consulting Organizations Directory found in the reference section of libraries Consultants News and Journal of Management Consulting are periodicals covering up-to-date information in the field Here are some associations for consultants: American Consultants League 30466 Prince William Street Princess Anne, MD 21853 Association of Management Consulting Firms 380 Lexington Avenue, Number 1699 New York, NY 10168-0002 amcforg Institute of Management Consultants 1200 19th Street NW, Suite 300 Washington, DC 20036-2428 imcusaorg National Association of Business Consultants 9438 US Highway 19 N, Suite 101 Port Richey, FL 34668 nabc-inccom Professional and Technical Consultants Association 849-B Independence Avenue Mountain View, CA 94043 patcaorg

The certificate backup should be stored in a secure location, and ideally separated from both the database backups and private key backup. We can back up the certificate and private key as follows:

-- Backup the certificate -- Required if restoring encrypted databases to another server -- Also required for server rebuild scenarios USE MASTER GO BACKUP CERTIFICATE tdeCertificate TO FILE = 'g:\cert\tdeCertificate.backup' WITH PRIVATE KEY (FILE = 'e:\cert\tdeCertificatePrivateKey.backup', ENCRYPTION BY PASSWORD = 'jjKiid_%%4-9') GO

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Now, let s change focus from the master database to the database we want to encrypt (AdventureWorks in this example) and create the database encryption key (DEK), used for encrypting the database with Transparent Data Encryption:

-- Create a Database Encryption Key USE [AdventureWorks2008] GO CREATE DATABASE ENCRYPTION KEY WITH ALGORITHM = AES_128 ENCRYPTION BY SERVER CERTIFICATE tdeCertificate GO

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