Mono-Alphabetic Encryption

This program is for implementing MONOALPHABETIC encryption . This is a part of Mumbai University MCA Colleges Data Communication and Networking MCA Sem 4

MONOALPHABETIC:

#include<stdio.h>

#include<conio.h>

void main()

{

int i,n;

char *ciper,*plan,*plan2;

clrscr();

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

gets(plan);

puts("\nEnter the Charter difference : ");

scanf("%d",&n);

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

{

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

            ciper[i]=plan[i]+n;

else if((plan[i]>90-n && plan[i]<=90)||(plan[i]>122-n && plan[i]<=122))

            ciper[i]=plan[i]-26+n;

else

            ciper[i]=plan[i];

}

ciper[i]='\0';

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

puts(ciper);

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

{

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

            plan2[i]=ciper[i]-n;

else if((ciper[i]>=65 && ciper[i]<=65+n)||(ciper[i]>=97 && ciper[i]<=97+n))

            plan2[i]=ciper[i]+26-n;

else

            plan2[i]=ciper[i];

}

plan2[i]='\0';

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

puts(plan2);

getch();

}



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