The key size of the International Data Encryption Algorithm (IDEA) is ________ bits.

A.
64

B.
128

C.
160

D.
192

Explanation:
The International Data Encryption Algorithm (IDEA) is a block cipher
that operates on 64-bit blocks of data with a 128-bit key. The data blocks are
divided into 16 smaller blocks and each has eight rounds of mathematical functions
performed on it. It is used in the PGP encryption software.