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).
The correct answer is A. The default for TDE tablespace encryption is AES128, while for TDE column encryption it is AES192.
https://docs.oracle.com/database/121/ASOAG/asotrans_config.htm#ASOAG9555
http://docs.oracle.com/cd/E11882_01/server.112/e25494/tspaces.htm#ADMIN12327