go through one round of DES encryption standard. Suppose the plaintext and the key are the same (in HEX format): 0x0123456789ABCDEF.

Derive K1, the first round subkey

Derive L0, R0

Expand R0 to get E[R0], where E[ ] is the expansion function

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