Hello! I need help with below questions. Thank You.

This question asks you to go through one round of DES encryption standard.

Suppose the plaintext and the key are the same (in HEX format): 0x0123456789ABCDEF.

(1) Derive K1, the first round subkey. Solution is provided:

Key: 0x0123456789ABCDEF

key (binary) : 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111

K1: 0000 1011 0000 0010 0110 0111 1001 1011 0100 1001 1010 0101

Derive L0, R0 (Applying Initial Permutation).

Expand R0 to get E[R0], where E[.] is the expansion function as shown in page 18 of the slide about DES.

Calculate A=E[R0] XOR K1.

Group the 48-bit result of d into sets of 6 bits and evaluate the corresponding S-box substitutions.

Concatenate the results of (e) to get a 32-bit result, B.

Apply the permutation to get p(B).

Calculate R1=P(B) XOR L0