Encryption is one of several defenses-in-depth that are available to the administrator who wants to secure an instance of SQL Server.Encryption algorithms define data transformations that cannot be easily reversed by unauthorized users. Separately enable TDE if you want to protect distribution and subscriber databases.Snapshot replication can store data in unencrypted intermediate files like BCP files. It does not protect data in transit nor data in use. TDE transparently encrypts data at rest in Oracle Databases.
If you use compression, you should compress data before encrypting it.The RC4 algorithm is only supported for backward compatibility.

It shows the current state of the encryption scan. Yesterday I was approached by the IA (Information Assurance) team and they wanted to know what was the encryption level (key length and algorithm) of one of the database servers.
The data in unencrypted data files can be read by restoring the files to another server. The encryption uses a database encryption key (DEK). To help secure a database, you can take precautions like:But a malicious party who steals physical media like drives or backup tapes can restore or attach the database and browse its data.One solution is to encrypt sensitive data in a database and use a certificate to protect the keys that encrypt the data. For more information, see the "Catalog views and dynamic management views" section earlier in this article.In TDE, all files and filegroups in a database are encrypted. But you must plan this kind of protection in advance.TDE does real-time I/O encryption and decryption of data and log files. Figure 2-1 an overview of the TDE column encryption process. It lets you follow many laws, regulations, and guidelines established in various industries. For more information on using TDE with SQL Database, see After you secure a database, you can restore it by using the correct certificate.

The master key and certificate are required to restore backups that were taken when the database was encrypted with TDE. You can use the single-user mode setting for the database to do maintenance operations. The DEK is a symmetric key. The TDE master encryption key is stored in an external security module, which can be an Oracle software keystore or hardware keystore. Using the same RC4 key repeatedly is a well-known error that will result in very weak encryption. The message indicates that an existing scan has been paused.Letting a database use TDE removes the remaining part of the current virtual transaction log. Without the original encryption certificate and master key, the data cannot be read when the drive is accessed or the physical media is stolen. For more information about certificates, see After you enable TDE, immediately back up the certificate and its associated private key. Do not use this feature in new development work, and modify applications that currently use this feature as soon as possible.For more information about encryption algorithms and encryption technology, see DESX was incorrectly named. The pages in an encrypted database are encrypted before they're written to disk and are decrypted when read into memory. Transparent Data Encryption (often abbreviated to TDE) is a technology employed by Microsoft, IBM and Oracle to encrypt database files. ENCRYPTION_ALGORITHM parameter specifies the encryption algorithm to be used during the export, with the default being “AES128” other value includes AES128, AES192 and AES256.

To use older algorithms (not recommended) you must set the database to database compatibility level 120 or lower.No single algorithm is ideal for all situations, and guidance on the merits of each is beyond the scope of SQL Server Books Online.


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