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