$1)$ Implement the DES system in C$++,$ java, Perl, etc., and the purpose of it is to train and enhance your programming skills using bit operations and manipulating bits in fluency. Then, decrypt the ciphertext string using the key$=$A$68$FDB$5$C$81430$E$92($in hexadecimal$).$ The decrypted plaintext should be in standard English text, not in hexadecimal.

The parameters for DES are listed below:

int E$[48]=\{$

$32,1,2,3,4,5,$

$4,5,6,7,8,9,$

$8,9,10,11,12,13,$

$12,13,14,15,16,17,$

$16,17,18,19,20,21,$

$20,21,22,23,24,25,$

$24,25,26,27,28,29,$

$28,29,30,31,32,1\}$;

int IP$[64]=\{$

$58,50,42,34,26,18,10,2,$

$60,52,44,36,28,20,12,4,$

$62,54,46,38,30,22,14,6,$

$64,56,48,40,32,24,16,8,$

$57,49,41,33,25,17,9,1,$

$59,51,43,35,27,19,11,3,$

$61,53,45,37,29,21,13,5,$

$63,55,47,39,31,23,15,7\}$;

int S$[8][4][16]=\{$

$\{14,4,13,1,2,15,11,8,3,10,6,12,5,9,0,7,$

$0,15,7,4,14,2,13,1,10,6,12,11,9,5,3,8,$

$4,1,14,8,13,6,2,11,15,12,9,7,3,10,5,0,$

$15,12,8,2,4,9,1,7,5,11,3,14,10,0,6,13$

$\},$

$\{$

$15,1,8,14,6,11,3,4,9,7,2,13,12,0,5,10,$

$3,13,4,7,15,2,8,14,12,0,1,10,6,9,11,5,$

$0,14,7,11,10,4,13,1,5,8,12,6,9,3,2,15,$

$13,8,10,1,3,15,4,2,11,6,7,12,0,5,14,9$

$\},$

$\{$

$10,0,9,14,6,3,15,5,1,13,12,7,11,4,2,8,$

$13,7,0,9,3,4,6,10,2,8,5,14,12,11,15,1,$

$13,6,4,9,8,15,3,0,11,1,2,12,5,10,14,7,$

$1,10,13,0,6,9,8,7,4,15,14,3,11,5,2,12$

$\},$

$\{$

$7,13,14,3,0,6,9,10,1,2,8,5,11,12,4,15,$

$13,8,11,5,6,15,0,3,4,7,2,12,1,10,14,9,$

$10,6,9,0,12,11,7,13,15,1,3,14,5,2,8,4,$

$3,15,0,6,10,1,13,8,9,4,5,11,12,7,2,14$

$\},$

$\{$

$2,12,4,1,7,10,11,6,8,5,3,15,13,0,14,9,$

$14,11,2,12,4,7,13,1,5,0,15,10,3,9,8,6,$

$4,2,1,11,10,13,7,8,15,9,12,5,6,3,0,14,$

$11,8,12,7,1,14,2,13,6,15,0,9,10,4,5,3,$

$\},$

$\{$

$12,1,10,15,9,2,6,8,0,13,3,4,14,7,5,11,$

$10,15,4,2,7,12,9,5,6,1,13,14,0,11,3,8,$

$9,14,15,5,2,8,12,3,7,0,4,10,1,13,11,6,$

$4,3,2,12,9,5,15,10,11,14,1,7,6,0,8,13$

$\},$

$\{$

$4,11,2,14,15,0,8,13,3,12,9,7,5,10,6,1,$

$13,0,11,7,4,9,1,10,14,3,5,12,2,15,8,6,$

$1,4,11,13,12,3,7,14,10,15,6,8,0,5,9,2,$

$6,11,13,8,1,4,10,7,9,5,0,15,14,2,3,12$

$\},$

$\{$

$13,2,8,4,6,15,11,1,10,9,3,14,5,0,12,7,$

$1,15,13,8,10,3,7,4,12,5,6,11,0,14,9,2,$

$7,11,4,1,9,12,14,2,0,6,10,13,15,3,5,8,$

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