Which of the following encryption algorithms is a symmetric-key encryption method that uses a 168-bit key?

Which of the following encryption algorithms is a symmetric-key encryption method that uses a
168-bit key?

A.
CAST Cipher

B.
DES

C.
AES (Rijndael)

D.
3DES

E.
Blowfish

Explanation:

3DES uses 168 bits. AES uses 128 – 256 bits