Security → Encryption
Transparent Database Encryption (TDE) tablespace encryption now supports Advanced Encryption Standard (AES) XTS (XEX-based mode with ciphertext stealing mode) in CREATE TABLESPACE statements. Earlier versions of Oracle Database TDE used AES-CFB cipher mode.
Business Benefit: AES-XTS provides improved security and better performance, especially on platforms where TDE can take advantage of parallel processing and specialized instructions built into processor hardware.