Implement a cryptographic system using the Reverse cipher method. - C Data Structure

Description

Implement a cryptographic system using the Reverse cipher method.

Demo Code

#include <stdio.h>
#include <string.h>

char *msgOriginal = "this is a test";
char msgEncrypt[100];
char msgDecrypt[100];
int intChoice, length;

void encryptMsg()
{
  int i, j;// w w  w . j  av  a2 s  .c  o  m
  length = strlen(msgOriginal);
  j = length - 1;
  for (i = 0; i < length; i++) {
    msgEncrypt[j] = msgOriginal[i] ;
    j--;
  }
  msgEncrypt[length] = '\0';
  printf("\nEncrypted Message: %s", msgEncrypt);
}

void decryptMsg()
{
  int i, j;
  fflush(stdin);
  printf("Enter the Message to be Decrypted (upto 100 characters): \n");
  gets_s(msgEncrypt);
  length = strlen(msgEncrypt);
  j = length - 1;
  for (i = 0; i < length; i++) {
    msgDecrypt[j] = msgEncrypt[i] ;
    j--;
  }
  msgDecrypt[length] = '\0';
  printf("\nDecrypted Message: %s", msgDecrypt);
}

void main()
{
     encryptMsg();
     decryptMsg();
}

Result

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