Question: 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

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: Binary notation: 0123456789 ABCDEF 0000 0001 0010 0011 0100 0101

a. Derive $K_{1}$ , the first-round subkey.

b. Derive $L_{0}, R_{0}$ .

c. Expand $R_{0}$ to get $E [R_{0}]$ , where $E [\cdot]$ is the expansion function of Table 3.2.

d. Calculate $A = E [R_{0}] \oplus K_{1}$ .

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 (e) to get a 32-bit result, $B$ .

g. Apply the permutation to get $P (B)$ .

h. Calculate $R_{1} = P (B) \oplus L_{0}$ .

i. Write down the ciphertext.

Hexadecimal notation: Binary notation: 0123456789 ABCDEF 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111

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a First pass the 64bit input through PC1 Table 34a to produce a 56bit result Then perform a left circular shift separately on the two 28bit halves Fin... View full answer

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