Deffie-Hellman protocol sandbox

dh.php

<?php
    // private
    $A = 15; // Alice
    echo "Alice private key: " . $A . "(A)\n";
    $B = 5; // Bob
    echo "Bob private key: " . $B . "(B)\n";

    // public
    $a = pow(11, $A) % 23; // Alice
    echo "\nAlice public key: " . $a . "\n";
    $b = pow(11, $B) % 23; // Bob
    echo "Bob public key: " . $b . "\n";

    echo "\nFrom Bob: " . (pow($b, $A) % 23) . "\n";
    echo "From Alice: " . (pow($a, $B) % 23) . "\n";