How many rounds are used by DES?

A.
16

B.
32

C.
64

D.
48

Explanation:
“When the DES algorithm is applied to data, it divides the message into blocks and operates on them
one at a time. A block is made of 64 bits and is divided in half and each character is encrypted one at
a time. The characters are put through 16 rounds of transposition and substitution functions. The
order and type of transposition and substitution function depend on the value of the key that is
inputted into the algorithm. The result is the 64-bit block of ciphertext.” Pg. 526 Shon Harris: CISSSP
All-In-One Certification Guide