PolyAlphabeticCipher.java

import java.util.*;

public class Testing
{
	public static void main(String args[])
	{
	  Scanner in = new Scanner(System.in);
	  String password = in.nextLine();
	  String key = in.next();
	  int i;
	  /*key = key.toUpperCase();
	  //char keys[] = key.toCharArray();
	  password = password.toUpperCase();*/
	  int a[] = new int[key.length()];
	  for(i=0;i<key.length();i++)
	  {
	  	a[i] = key.charAt(i)-33;
	  }
	  char pass[] = password.toCharArray();
	  int k=0;
	  String ans = "";
	  for(i=0;i<password.length();i++)
	  {
	  	int temp = (pass[i]+a[k]-33)%94;
	  	//System.out.print(temp+" ");
	  	pass[i] = (char)(temp+33);
	  	k++;
	  	while(k==key.length())
	  	{
	  		k=0;
	  	}
	  	ans+=pass[i];
	  }
	  System.out.println("Password : "+password);
	  System.out.println("Encrypted Text : "+ans);
	  
	  k=0;
	  ans ="";
	  for(i=0;i<password.length();i++)
	  {
        int temp = (pass[i]-a[k]-33);
        if(temp<0)
        {
        	temp+=94;
        }
	  	pass[i] = (char)(temp+33);
	  	k++;
	  	if(k==key.length())
	  	{
	  		k=0;
	  	}
	  	ans+=pass[i];
	  }
	  System.out.println("Decrypted Text : "+ans);

	}
}