मैं उस ट्यूटोरियल को स्क्रैप कर दूंगा, लॉगिन सुरक्षा को हल्के में नहीं देखा जाना चाहिए, आपके पास डेटाबेस में सादा टेक्स्ट पासवर्ड नहीं होना चाहिए, उन्हें नमक के साथ धोया जाना चाहिए और सफल लॉगिन पर दोनों को बदलना चाहिए।

यहां एक सुरक्षित लॉगिन स्क्रिप्ट है:

यह डेटाबेस कनेक्शन के लिए पीडीओ का उपयोग करता है, वास्तविक लॉगिन फॉर्म लॉगिन के लिए यादृच्छिक कुंजी का उपयोग करता है। उपयोगकर्ता नाम/पासवर्ड नहीं। पासवर्ड sha512 x 25k बार और 16byte कुंजी नमक, जानवर बल सुरक्षा के साथ धोए जाते हैं। आशा है ये मदद करेगा।

<?php
session_start();

/**
 * Table

CREATE TABLE IF NOT EXISTS `users` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(45) DEFAULT NULL,
  `pass_hash` varchar(255) DEFAULT NULL,
  `pass_salt` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB  DEFAULT CHARSET=latin1 AUTO_INCREMENT=0 ;

 */

//DB Stuff
define('DBHOST','localhost');
define('DBNAME','yourdb');
define('DBUSER','root');
define('DBPASS','');
//End Config:---


//Open a PDO Database connection
try {
    $db = new PDO("mysql:host=".DBHOST.";dbname=".DBNAME, DBUSER, DBPASS);
    $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $db->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
}catch (Exception $e){
    die('Cannot connect to mySQL server.');
}


class Login{
    public $db;
    public $user;
    public $pass;
    public $error;
    // sha512
    public $algo = '$6';
    // Cost parameter, 25k iterations
    public $cost = '$rounds=25000$';

    function __construct(PDO $db){
        $this->db = $db;
        $this->global_salt = sha1($_SERVER['HTTP_HOST']);
    }

    /**
     * Return a random seed for the mt_rand function
     */
    function make_seed(){
        list($usec, $sec) = explode(' ', microtime());
        return (float) $sec + ((float) $usec * 100000);
    }

    /**
     * Return a random unique salt for new created hash/crypt function salts
     */
    function unique_salt(){
        $salt = null;
        mt_srand($this->make_seed());
        for($i=0;$i < mt_rand(1,10);$i++){
            $salt = sha1($this->global_salt.$salt.mt_rand().uniqid().microtime(true));
        }
        return substr($salt,0,16);
    }

    /**
     * Hash a given password and store parts in:
     * $this->salt = a unique 16 byte salt
     * $this->hash = The full crypted hash sting including algo/cost/salt/crytedpassword
     * $this->full_salt = Just algo/cost/salt section, the first 33 bytes 
     * $this->hashed_password = Just crytedpassword section, proceeding bytes after first 33 bytes
     * 
     */
    function hash($password){
        $this->salt = $this->unique_salt();
        $this->full_hash = crypt($password, $this->algo.$this->cost.$this->salt);
        $this->full_salt = substr($this->full_hash, 0, 33);
        $this->hashed_password = substr($this->full_hash, 33);
        return $this->full_hash;
    }

    /**
     * Method to validate the given crypto hash against the given password
     */
    function check_password($hash, $salt, $password){
        $hash = ($this->algo.$this->cost.$salt.'$'.$hash);
        if($hash == crypt($password, substr($hash, 0, 33))){
            //Regenerate new hash and salt for given password
            $this->update_keys();
            $this->status = true;
            $_SESSION['logged_in']=true;
            return true;
        }else{
            $this->status = false;
            return false;
        }
    }

    /**
     * Set error
     */
    function set_error($type,$value){
        $this->error[$type]=$value;
    }

    /**
     * Output error
     */
    function error($type){
        echo (isset($this->error[$type]))?$this->error[$type]:null;
    }

    /**
     * Logout and regenirate session and redirect to index
     */
    static function logout(){
        unset($_SESSION['logged_in']);
        session_regenerate_id(true);
        exit(header('Location: ./index.php'));
    }

    function anti_brute($intval){
        if(!isset($_SESSION['access_time'])){
            $_SESSION['access_time']=time();
        }else{
            $t = time()-$_SESSION['access_time'];
            if($t <= $intval){
                $this->set_error('global','Time violation');
                $_SESSION['access_time']=time();
                return true;
            }
            $_SESSION['access_time']=time();
            return false;
        }
    }

    function process_login(){
        if($_SERVER['REQUEST_METHOD']=='POST'){

            $this->user   = (isset($_SESSION['userParam']) && isset($_POST[$_SESSION['userParam']]))?$_POST[$_SESSION['userParam']]:null;
            $this->pass   = (isset($_SESSION['passParam']) && isset($_POST[$_SESSION['passParam']]))?$_POST[$_SESSION['passParam']]:null;
            $this->create = (isset($_SESSION['createParam']) && isset($_POST[$_SESSION['createParam']]))?$_POST[$_SESSION['createParam']]:null;

            $cont = true;
            if($this->user == null || strlen($this->user) <= 2){$this->set_error('user','Please enter a username!'); $cont=false;}
            if($this->pass == null || strlen($this->pass) <= 2){$this->set_error('pass','Please enter a password!'); $cont=false;}


            if($cont==true){
                //Alls good continue
                if($this->create != null && $this->create=='1'){
                    //Check user for new account
                    if($this->check_user()==true){$this->set_error('user','Username already taken.');return;}
                    //Create account
                    $this->create_account();
                }else{
                    //Stop really fast request 2 seconds
                    if($this->anti_brute(2)==false){
                        //Attempt to login
                        $this->check_login();
                    }
                }
            }else{
                //Error with form
                $this->set_error('global','Please fill in login form!');
            }
        }
    }

    function check_user(){
        $sql = 'SELECT 1 FROM users WHERE username=:username';
        $statement = $this->db->prepare($sql);
        $statement->bindParam(':username', $this->user, PDO::PARAM_STR);
        $statement->execute();
        $result = $statement->fetch(PDO::FETCH_ASSOC);

        if(!empty($result)){return true;}else{return false;}
    }

    function check_login(){
        $sql = 'SELECT pass_hash, pass_salt FROM users WHERE username=:username';
        $statement = $this->db->prepare($sql);
        $statement->bindParam(':username', $this->user, PDO::PARAM_STR);
        $statement->execute();
        $result = $statement->fetch(PDO::FETCH_ASSOC);

        $this->check_password($result['pass_hash'], $result['pass_salt'], $this->pass);
    }

    function create_account(){
        //Create new account
        $this->hash($this->pass);
        $sql = 'INSERT into users (username, pass_hash, pass_salt) VALUES (:username, :pass_hash, :pass_salt)';
        $statement = $this->db->prepare($sql);
        $statement->bindParam(':username', $this->user, PDO::PARAM_STR);
        $statement->bindParam(':pass_hash', $this->hashed_password, PDO::PARAM_STR);
        $statement->bindParam(':pass_salt', $this->salt, PDO::PARAM_STR);
        $statement->execute();

        $this->status = true;
        $_SESSION['logged_in']=true;
    }

    function update_keys(){
        //Update account password hash & salt
        $this->hash($this->pass);
        $sql = 'UPDATE users SET pass_hash=:pass_hash, pass_salt=:pass_salt WHERE username=:username';
        $statement = $this->db->prepare($sql);
        $statement->bindParam(':username', $this->user, PDO::PARAM_STR);
        $statement->bindParam(':pass_hash', $this->hashed_password, PDO::PARAM_STR);
        $statement->bindParam(':pass_salt', $this->salt, PDO::PARAM_STR);
        $statement->execute();

        $this->status = true;
        $_SESSION['logged_in']=true;
    }

}//END Login class

//Logout handler
if(isset($_GET['logout'])){ Login::logout(); }

$login = new Login($db);

//Login handler
$login->process_login();

//Debug
echo '<pre>';
print_r($login);
echo '</pre>';


//Check login status
if(isset($_SESSION['logged_in']) && $_SESSION['logged_in']==true){
    //Logged in
    echo '<a href="?logout">Logout</a>';
}else{
    //Not Logged In

    //Show login form & create uniqie parrams for user/pass/create post keys
    $_SESSION['userParam']   = sha1(uniqid().microtime(true));
    $_SESSION['passParam']   = sha1(uniqid().microtime(true));
    $_SESSION['createParam'] = sha1(uniqid().microtime(true));
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Secure Login</title>
</head>

<body>
<h1>Secure Login Example</h1>
<h3>Please login:</h3>

<?php $login->error('global'); ?>

<form method="POST" action="">
  <label for="user">Username :&nbsp; </label>
  <input type="text" name="<?=$_SESSION['userParam'];?>" size="29"> <?php $login->error('user'); ?>
  <br />
  <label for="pass">Password :&nbsp; </label>
  <input type="text" name="<?=$_SESSION['passParam'];?>" size="29"> <?php $login->error('pass'); ?>
  <br /> 
  <input type="submit" value="Login">&nbsp; and create my account:<input type="checkbox" name="<?=$_SESSION['createParam'];?>" value="1">
</form>
</body>
</html>
<?php } ?>

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