oeseling plain tese Es-nte.and then use Problem 4 125 Points: Decipher the messa

Question

oeseling plain tese Es-nte.and then use Problem 4 125 Points: Decipher the message CWCV YKECK. Asumethat youkeerwav- Amne cipher and further nore you know that the key of the corresponding and a plain text "en is enciphered to "C". Please statethe details or herwyouwaae corresponding plain text by including ( 1 ) the values of the cipher text VS points. eywddcas on of how do you get the key of corresponding additive cipher 17 points: O)the value, corresponding plain text IS points: and then (4) the final result of correspondingplanwx1(8 points].

Explanation / Answer

This Programme for converting plain text to cipher text:

#include <stdio.h>
#include <string.h>
int main()
{
        char plainText[100], cipherText[100], value;
        int i = 0, auto_key;

        /* We are taking input string from the user */
        printf("Enter the value of plain text(captial letters):");
        fgets(plainText, 100, stdin);

        /* We are taking autokey as a input from the user */

        printf("Enter the auto key to convert cipher text:");
        scanf("%d", &auto_key);
        plainText[strlen(plainText) - 1] = '';

        /* converting plain text to cipher text */
        while (plainText[i] != '') {
                if ((plainText[i] + auto_key) > 'Z') {
                        value = (plainText[i] + auto_key) - 'Z';
                        cipherText[i] = 'A' + value - 1;
                } else {
                        cipherText[i] = plainText[i] + auto_key;
                }
                i++;
        }

        cipherText[i] = '';
    /* print message of the cipher text */
        printf("The values of the ciphertext: %s ", cipherText);
        i = 0;

       /* Again here converting cipher text to plain text */
        printf("Final result of Corresponding Plain Text:");
        while (cipherText[i] != '') {
                if ((cipherText[i] - auto_key) < 'A') {
                        printf("%c", 'Z' + 1 - ('A' - (cipherText[i] - auto_key)));
                }
               else
               {
                        printf("%c", cipherText[i] - auto_key);
                }
                i++;
        }
        printf(" ");
        return 0;
}

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