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import java.io.*;
import java.math.*;
import java.util.*;

public class RSA {
	public static double gcd(double a, double h)
	{
		
		double temp;
		while (true) {
			temp = a % h;
			if (temp == 0)
				return h;
			a = h;
			h = temp;
		}
	}
	public static void main(String[] args)
	{
		double p = 3;
		double q = 7;
		double n = p * q;

		double e = 2;
		double phi = (p - 1) * (q - 1);
		while (e < phi) {
			
			if (gcd(e, phi) == 1)
				break;
			else
				e++;
		}
		int k = 2; // A constant value
		double d = (1 + (k * phi)) / e;

		// Message to be encrypted
		double msg = 12;

		System.out.println("Message data = " + msg);

		// Encryption c = (msg ^ e) % n
		double c = Math.pow(msg, e);
		c = c % n;
		System.out.println("Encrypted data = " + c);

		// Decryption m = (c ^ d) % n
		double m = Math.pow(c, d);
		m = m % n;
		System.out.println("Original Message Sent = " + m);
	}
}

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