UGC NET Computer Science December 2019 | Question 140

Question 140

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The Data Encryption Standard (DES) has a function consists of four steps. Which of the following is correct order of these four steps?

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

Answer : 2. an expansion permutation, an XOR operation, S-boxes, a straight permutation

Explanation Question 140

Reference : Data Encryption Standard - Round Function

Steps inside DES Round Function are an expansion permutation, an XOR operation, S-boxes, a straight permutation.

So, option 2 is correct answer

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UGC NET CS December 2019 - Question 139	UGC NET CS December 2019 - Question 141