Assuming the output of the first application $($round$)$ of $f_{}$ of S$-$DES is $00101011$ and $K_2$ is $10111001,$ what is the output ciphertext? You may use the information below $($note: you need to determine IP ${?}^{-1}$ yourself$).$

$C=$

$($write your final answer above; show calculations on next page$)$

$IP$: $26314857,\frac{E}{P}$:$41232341,P4$:$2431$

$S0=\left[\begin{array}{cccc}01& 00& 11& 10\\ 11& 10& 01& 00\\ 00& 10& 01& 11\\ 11& 01& 11& 10\end{array}\right],S1=\left[\begin{array}{cccc}00& 01& 10& 11\\ 10& 00& 01& 11\\ 11& 00& 01& 00\\ 10& 01& 00& 11\end{array}\right]$