The Data Encryption Algorithm performs how many rounds of substitution and permutation?
A.
4
B.
16
C.
54
D.
64
Explanation:
International Data Encryption Algorithm (IDEA) is a block cipher and operates on 64-bit blocks of data, which is
divided into 16 smaller blocks, and each has eight rounds of mathematical functions performed on it.
Incorrect Answers:
A: This is the size of one of the smaller blocks.
C: This is not a valid block size for block ciphers.
D: This is incorrect as it is the initial size of the block.Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, pp. 809, 810