uH8mPCfR

1package sample;
2
3import javafx.application.Application;
4import javafx.fxml.FXMLLoader;
5import javafx.scene.Parent;
6import javafx.scene.Scene;
7import javafx.stage.Stage;
8import java.util.Scanner;
9import java.math.BigInteger;
10import java.security.SecureRandom;
11import java.util.Random;
12
13public class Main extends Application {
14
15    @Override
16    public void start(Stage primaryStage) throws Exception{
17
18        Random generator = new Random();
19
20
21
22        BigInteger p, b, c, secretKey, extraOne;
23        extraOne = new BigInteger("1");
24        Random sc = new SecureRandom();
25        secretKey = new BigInteger("1");
26        //
27        // public key calculation
28        //
29        System.out.println("secretKey = " + 2);
30        p = BigInteger.probablePrime(64, sc);
31        b = new BigInteger("3");
32        c = b.modPow(secretKey, p);
33        System.out.println("p = " + p);
34        System.out.println("b = " + b);
35        System.out.println("c = " + c);
36        //
37        // Encryption
38        //
39        System.out.print("Enter your Big Number message -->");
40        Scanner keyboard = new Scanner(System.in);
41        System.out.println("enter an integer");
42        int myint = keyboard.nextInt();
43        String s = Integer.toString(myint);
44        BigInteger X = new BigInteger(s);
45        BigInteger r = new BigInteger(64, sc);
46        BigInteger EC = X.multiply(c.modPow(r, p)).mod(p);
47        BigInteger brmodp = b.modPow(r, p);
48        System.out.println("Plaintext = " + X);
49        System.out.println("r = " + r);
50        System.out.println("EC = " + EC);
51        System.out.println("b^r mod p = " + brmodp);
52        //
53        // Decryption
54        //
55        BigInteger crmodp = brmodp.modPow(secretKey, p);
56        BigInteger d = crmodp.modInverse(p);
57        BigInteger ad = d.multiply(EC).mod(p);
58        System.out.println("\n\nc^r mod p = " + crmodp);
59        System.out.println("d = " + d);
60        System.out.println("Alice decodes: " + ad);
61
62    }
63
64
65    public static void main(String[] args) {
66
67        launch(args);
68    }
69}