Polyalphabetic Encryption C/C++

This program is for implementing Poly-Alphabetic Encryption. This is a part of Mumbai University MCA Colleges Data Communication and Networking MCA Sem 4

#include<stdio.h>

#include<conio.h>

void main()

{

int i,n,j,k=0;

char *ciper,*plan,*plan2;

clrscr();

puts("\nEnter the sender side text : ");

gets(plan);

puts("\nEnter the groups of character : ");

scanf("%d",&n);

for(i=0;plan[i]!='\0';i=i+n)

{

 k++;

 for(j=i;j<i+n;j++)

 {

  if((plan[j]>=65 && plan[j]<=90-k) || (plan[j]>=97 && plan[j]<=122-k))

            ciper[j]=plan[j]+k;

  else if((plan[j]>90-k && plan[j]<=90)||(plan[j]>122-k && plan[j]<=122))

            ciper[j]=plan[j]-26+k;

  else

            ciper[j]=plan[j];

 }

}

ciper[j]='\0';

puts("\nThe trasmitted data is  : \n");

puts(ciper);

k=0;

for(i=0;ciper[i]!='\0';i=i+n)

{

 k++;

 for(j=i;j<i+n;j++)

 {

  if((ciper[j]>=65+k && ciper[j]<=90) || (ciper[j]>=97+k && ciper[j]<=122))

            plan2[j]=ciper[j]-k;

  else if((ciper[j]>=65 && ciper[j]<=65+k)||(ciper[j]>97 && ciper[j]<=97+k))

            plan2[j]=ciper[j]+26-k;

  else

            plan2[j]=ciper[j];

 }

}

plan2[j]='\0';

puts("\nThe Reciver side data is  : \n");

puts(plan2);

getch();

}



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