Question

Implement a Java program for Diffie-Hellman manually insert p, g, a, and b to get shared key.

Write a Java

Answer 1

I have included my code and screenshots in this answer. In case, there is any indentation issue due to editor, then please refer to code screenshots to avoid confusion.

--------------------solution.java-------------------

import java.util.*;
import java.math.BigInteger; //to stor big integers

public class solution{
   public static void main(String[] args){
       Scanner scan = new Scanner( System.in );
       System.out.print("\nEnter p: ");
       BigInteger p = scan.nextBigInteger(); //read p

       System.out.print("\nEnter g: ");
       BigInteger g = scan.nextBigInteger(); //read g

       System.out.print("\nEnter a: "); //read a
       int a = scan.nextInt();

       System.out.print("\nEnter b: "); //read b
       int b = scan.nextInt();

       BigInteger Shared_key = ((g.pow(a).mod(p)).pow(b)).mod(p); //shared key = g^(ab)mod(p)

       System.out.print("\nShared_key = " + Shared_key + "\n");
   }
}

--------------------Screenshots solution.java-------------------

--------------------Output------------------

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I hope this helps you,

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