Using Transparent Data Encryption . Credit card numbers, medical and health records, and other personal information must be stored and secured in such a way that only authorized personnel are able to access the information. Before SQL Server 2. Managing the encryption keys was a manual process, and accessing the encrypted data required writing application code. SQL Server 2. 00. Transparent Data Encryption (TDE) technology. TDE is essentially an enterprise- oriented feature and is available only in the following editions of SQL Server: SQL Server 2. Securing computer data through encryption software has become a clear necessity for many businesses and individuals carrying sensitive information on their. Get the latest breaking news across the U.S. Bitdefender Total Security Key 2018 Download Bitdefender Total Security 2018 v22.0 Crack is a leading anti-malware software use to protect your PC against all kinds. How To Crack File Vault 2 Encryption MeaningEnterprise, Developer, and Evaluation editions SQL Server 2. R2 Datacenter, Enterprise, Developer, and Evaluation editions SQL Server 2. Enterprise, Developer, and Evaluation editions. Related: Securing Credit Card Data Through SQL Server 2. Related: Database Encryption Solutions Understanding TDE TDE provides the ability to encrypt an entire database and to have the encryption be completely transparent to the applications that access the database. ![]() TDE encrypts the data stored in both the database's data file (. Advanced Encryption Standard (AES) or Triple DES (3. DES) encryption. In addition, any backups of the database are encrypted. This protects the data while it's at rest as well as provides protection against losing sensitive information if the backup media were lost or stolen. Data is encrypted on the disk and is decrypted as it's read into memory. Performing the encryption at the page level enables the encryption process to be completely transparent to the client applications.
There are no limitations on the ability to search or query the data in the encrypted database. In addition, since most database applications are optimized to minimize I/O for performance reasons, tying the encryption process to the database engine takes advantage of the existing application optimization and makes the encryption process very efficient. If the database is being used with Always. On Availability Groups, database mirroring, or log shipping, the databases on all of the participating systems will be encrypted. It's important to note that although TDE encrypts the stored data, it doesn't encrypt the communications link between the server and the client applications. If you need to encrypt the data connection between the application and the server, you need to use an SSL connection for the clients. Other technologies such as database mirroring and Always. On Availability Groups support network transport encryption in the properties of their endpoints. To encrypt a database, follow these steps: 1. Create a master key for the database. Create a certificate that's protected by the master key. Create a special key that's used to protect the database. This key is called the database encryption key (DEK) and you secure it using the certificate. Enable encryption. Using this code as a reference, let's take a closer look at these steps.- - The master key must be in the master database. It's important to note that the master key must be created in the master database. At the top of Listing 1, you can see where the USE statement changes the current database to the master database. ![]() The CREATE MASTER KEY statement is then used to create a master key along with an associated password in the master database. After the certificate is created, the USE statement switches the current database to the My. Database database, where the CREATE DATABASE ENCRYPTION KEY statement is used to create a new DEK with the AES encryption algorithm. You can choose from one of the following encryption algorithms: AES. The encryption process runs as a background task, so the database remains available while it's being encrypted. However, there's a performance impact during this time. It's important to note that if any database on a server is encrypted using TDE, the tempdb database will also be encrypted. Likewise, if you need to move an encrypted database from one SQL Server instance to another server, you also need to move the certificate. The code in Listing 2 shows how to back up the certificate to a file in the file system. This file can then be backed up or copied to another system to allow the encrypted database to be restored. USE Master GOBACKUP CERTIFICATE My. SQLCert. TO FILE = 'C: \temp\My. SQLCert'WITH PRIVATE KEY (file='C: \temp\My. SQLCert. Key',ENCRYPTION BY PASSWORD='My. Strong. Password. Because the master key is in the master database, the code in Listing 2 begins by applying the USE statement to switch to the master database. It then uses the BACKUP CERTIFICATE statement to copy the certificate to the C: \temp\My. SQLCert file and the key to the C: \temp\My. SQLCert. Key file. Listing 3 demonstrates how to move a backed up certificate to a new SQL Server instance. The USE statement switches the current database to the master database, which is where the new master key must be created. Next, the CREATE MASTER KEY ENCRYPTION statement is executed to create a new master key. The new master key has a strong password associated as well. The CREATE CERTIFICATE statement is used to create a new certificate named My. SQLCert. This statement is different from the one used in Listing 1, because this statement uses the FROM FILE clause to point to the backed up certificate that was created with the code in Listing 2. The WITH PRIVATE KEY clause points to the backup of the decryption key file. Finally, the password to decrypt the certificate is supplied using the DECRYPTION BY PASSWORD clause. USE Master GO- - Create a new master key. CREATE MASTER KEY ENCRYPTIONBY PASSWORD = 'My. New. Strong. Password'- - Restore the certificate. CREATE CERTIFICATE My. SQLCert. FROM FILE='c: \temp\My. SQLCert'WITH PRIVATE KEY (FILE = 'c: \temp\My. SQLCert. Key',DECRYPTION BY PASSWORD='My. Strong. Password. Monitoring TDE You can monitor TDE with the sys. Listing 4 shows how to query sys. It also shows how to query sys. Better yet, TDE provides this added security without requiring any application code changes. Related: Securing Your SQL Server Environment.
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