$2.$ Consider a sender and receiver who need to exchange data confidentially using

symmetric encryption. Write a program to implement DES First round Key. In DES

Algorithm If the key with parity bit $(64$ bits$)$ is AABB$09182736$CCDD$,$ find the first

round key.

DES Key Generation.

Input Key

$12345678$

$910111213141516$

$1718192021222324$

$2526272829303132$

$3334353637383940$

$4142434445464748$

$4950515253545556$

$5758596061626364$

Permuted Choice one $($PC$-1)$

$5749413325179$

$1585042342618$

$1025951433527$

$1911360524436$

$63554739312315$

$7625446383022$

$1466153453729$

$211352820124$

Permuted Choice two $($PC$-2)$

$1417112415328$

$15621102319124$

$2681672720132$

$4152313747553040$

$5145334844493956$

$3453464250362932$

Schedule of Left Shifts

Round

Number

$12345678910111213141516$

Bits

Rotated

$1122222212222221$