NTA NET DEC 2019 (DES)

Question

The Data Encryption Standard (DES) has a function consists of four steps. Which of the

        following is correct order of these four steps?

1. An expansion permutation, S boxes, an XOR operation, a straight permutation
2. An expansion permutation, an XOR operation, S-boxes, a straight permutation
3. A straight permutation, S – boxes, an XOR operation, an expansion permutation
4. A straight permutation, an XOR operation, S boxes, an expansion permutation

 

Answer 1

$\underline{\textbf{Answer:}\Rightarrow}\;2)$ 

$\underline{\textbf{Explanation:}\Rightarrow}$

$\therefore\;\text{Option}\;2) $ is the correct answer.