Which of the following encryption algorithms is the default for Transparent Data Encryption (TDE)
tablespace encryption?
A.
AES128
B.
AES192
C.
AES256
D.
3DES168
Explanation:
By default, TDE uses the AES encryption algorithm with a 192-bit key length (AES192).
Correct answer is A
as per Oracle Documentation
http://www.oracle.com/technetwork/database/security/tde-faq-093689.html#A12003
What are the encryption algorithms that can be used with TDE?
TDE supports AES256, AES192 (default for TDE column encryption), AES128 (default for TDE tablespace encryption), and 3DES168.