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Playfair cipher
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#include<stdio.h>
#include<conio.h>
#include<string.h>
#include<ctype.h>
#define MX 5
void playfair(char ch1,char ch2, char key[MX][MX])
{
int i,j,w,x,y,z;
FILE *out;
if((out=fopen("cipher.txt","a+"))==NULL)
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