Question: Cryptography The DES S-box S_4 has some unusual properties: (a) Prove that the second row of S_4 can be obtained from the first row by

Cryptography Cryptography The DES S-box S_4 has some unusual properties: (a) Prove

The DES S-box S_4 has some unusual properties: (a) Prove that the second row of S_4 can be obtained from the first row by means of the following mapping: (y_1, y_2, y_3, y_4) rightarrow (y_2, y_1, y_4, y_3) (0, 1, 1, 0), where the entries are represented as binary strings. (b) Show that any row of S_4 can be transformed into any other row by a similar type of operation

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