Teaching UGC NET Mock Test Series 2025 (Paper 1 & 2) Computer Networks Network Security Cryptography
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