Suppose Data Encryption Standard (DES) is used to encrypt the following 64-bit block of plaintext: 6 3 F A C 0 D 0 3 4 D 9 F 7 9 3 Given the initial 64-bit key is: 1 C 5 8 7 F 1 C XXXXXXXXXXF E F (1)...


Suppose Data Encryption Standard (DES) is used to encrypt the following 64-bit block of
plaintext:
6 3 F A C 0 D 0 3 4 D 9 F 7 9 3
Given the initial 64-bit key is: 1 C 5 8 7 F 1 C 1 3 9 2 4 F E F
(1) Derive the first-round subkey, K1, representing in both binary and hexadecimal.


(2) Derive left and right parts of the plaintext, L0, R0, representing in both binary and
hexadecimal.


(3) Expand R0 to get E[R0].


(4) Calculate A= E[R0] XOR K1, representing in both binary and hexadecimal.


(5) Group the 48-bit results of (4) into sets of 6 bits and evaluate the corresponding S-box
substitutions, representing in both binary and hexadecimal.



Jun 10, 2022
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