index.php

<?php
	$pass= 'testing'; // password
	$salt = 'st'; // extra layer of protection

	// encrypt the password
	$md5pass = md5($pass);  // broken into by hackers
	$sha1pass = sha1($pass); // already broken into by hackers
	$cryptpass = crypt($pass, $salt); // second layer of security $salt
	// salt makes encryption a lot stronger, since they have to 
	// know the encryption algorith you used as well as the salt 
	// in order to crack your password

	// hash generated by each
	echo "$md5pass <br  />"; 
	echo "$sha1pass <br  />"; 
	echo "$cryptpass <br  />";  

	// stronger layer of security when encrypting one within the other
	// this way they have to work backwards and know 
	// which algorithms you used (in this case 3)
	// way harder because even if they break into one, all they see is a hash or garbage
	$sha1pass = sha1($md5pass);  // sha1 gets md5 hash
	$cryptpass = crypt($sha1pass); // crypt gets sha1 hash



	echo "$cryptpass";
	echo "<br /> ----------------- <br  />";

	// a total of three layers, much harder to break into but not impossible
	if (crypt(sha1(md5($pass)) == $cryptpass))
	{
		// if statement is true if the encrypted string equals all the steps above
		// simplified for you
		echo "Password is well encrypted";
	}
	// md5 password gets encrypted with sha1, and sha1 is encrypted with crypt password
?>