(Solved):   Please provide step by step explanation This problem provides a numerical example of encrypt ...

 

Please provide step by step explanation

This problem provides a numerical example of encryption using a one-round version of DES We start with the same bit pattern for the key \( K \) and the plaintext, namely: Hexadecimal notation: 0123456789 A B C D E F Binary notation: \( \quad 00000001001000110100010101100111 \) 10001001101010111100110111101111 a. Derive \( K 1 \), the first-round subkey. b. Derive \( L 0, R 0 \). c. Expand \( R 0 \) to get \( \mathrm{E}[R 0] \), where \( \mathrm{E}[.] \) is the expansion function of Table S.1. d. Calculate \( A=\mathrm{E}[R 0] \bigoplus K 1 \). e. Group the 48-bit result of \( (d) \) into sets of 6 bits and evaluate the corresponding S-box substitutions. f. Concatenate the results of \( (\mathrm{e}) \) to get a 32-bit result, \( B \). g. Apply the permutation to get \( \mathrm{P}(B) \). h. Calculate \( R 1=\mathrm{P}(B) \bigoplus L 0 \). i. Write down the ciphertext.