Which type of encryption does Oracle Autonomous Database utilize for data at rest?

Oracle Autonomous Database utilizes Transparent Data Encryption (TDE) for data at rest. TDE is a widely used method for encrypting database files to protect sensitive data. It operates by encrypting the data stored in the database and the associated data files, providing security without requiring changes to the application logic.

One of the significant advantages of TDE is that it encrypts the data transparently, meaning that users and applications do not need to modify their behaviors or implement additional encryption mechanisms when accessing the encrypted data. This ensures that the protection of sensitive information is seamless while maintaining accessibility for authorized users.

While AES encryption and the Advanced Encryption Standard are indeed encryption algorithms, they are the underlying technology that may be used within TDE. However, TDE is specifically designed for data at rest and includes features like key management, which are not inherent in just identifying encryption algorithms.

Block-Level Encryption typically refers to a method of encrypting raw data on a storage device. This approach is more commonly associated with file systems or storage solutions rather than database management systems, making it less applicable in the context of Oracle Autonomous Database's specific approach to protecting data at rest.