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Use these tables only. Please, help!! Thi s problem provides a numerical example of encryption using a one-round version of DES. We start with the

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Use these tables only.

image text in transcribed

Please, help!!

Thi s 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 0123 456789ABCDEF Binary notation: 00000001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 a. Derive K,the first-round subkey b. Derive Lo,Ro c. Expand Ro to get E[R, where F is the expansion function of Table S.1 d. Calculate A E[Rol Ki e. Group the 48-bit result of (d) into sets of 6 bits and evaluate the corresponding SNxditutions. f. Concatenate the results of (e) to get a 32-bit result, B. g. Apply the permutation to get P(B) h. Calculate R1-P(B Lo- i. Write down the ciphertext

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