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I would like to create a a random number with random_bytes(). Can I just store the random_bytes output in the database field? Is that for instance more secure? And, regarding to sending it by email, what is the advantage above sending a code like uniqid() or md5($_POST['var'] + microtime() ? I see the screen output is a bit uncommon (with ? in a diamond ) does that have to do with the encryption? And is that the reason why reason bin2hex is used to decrypt? this is the code I would like to use: <html> <center> <br><br><br> the output of the function random_bytes is: <br><br> <?php $num = random_bytes(15); echo '<br><br>' . $num ; echo '<br><br> var dump of random_bytes with bin2hex: ' ; echo bin2hex($num); ?> </center></html>