PHP "randomize" the rand() function? - php

Question

Hi everyone I was wondering what could be possible to randomize this code even further :
<?php
$key=md5('ILOVEYOU');
$serverseed = floor(time() / 5);
srand($serverseed);
$result = rand();
$modulus_result= $result % 100;
echo "before: ".$modulus_result."<br>";
echo "after: ".encrypt($modulus_result, $key)."<br>";
echo decrypt($modulus_result, $key);
function decrypt($string, $key){
$string = rtrim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, base64_decode($string), MCRYPT_MODE_ECB));
return $string;
}
function encrypt($string, $key){
$string = rtrim(base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $string, MCRYPT_MODE_ECB)));
return $string;
}
?>
Ok for everyone that stumbled upon this thread and missunderstood the topic, I'm not using this function to protect ANYTHING inside my website, I'm just looking ways to randomize this function as it uses time() as a reference...
I need to generate a random int from 1-100, that seems to work, I'm just looking for other ways to randomize it( if I could explain a bit more, adding some sort of "salt" not encryption of any sort.)

Answer 1

Check the documentation:
This function does not generate cryptographically secure values, and
should not be used for cryptographic purposes. If you need a
cryptographically secure value, consider using random_int(),
random_bytes(), or openssl_random_pseudo_bytes() instead.
You might want to use random_int instead.
The problem with that is that was introduced with PHP 7 so you might not be able to use it. In this case, you can get it here, as mentioned in the documentation.