How Can PDO and Password Hashing Secure My Code Against Attacks?

Securing Your Code with Password Hashing Using PDO

Your current code lacks sufficient security measures, leaving your system vulnerable to attacks. Incorporating password hashing into your application is crucial to protect user credentials.

Why Password Hashing?

Hashing involves encrypting a password with a one-way function that generates a unique and irreversible hash. This prevents unauthorized access to stored passwords even if the database is compromised.

Incorporating Password Hashing

To enhance the security of your code, consider using a reputable library that handles password hashing.

• PHP 5.5 supports password_hash()
• PHP 5.3.7 can utilize password-compat (compatibility pack for password_hash())
• Other PHP versions: Use phpass

In your code, replace the existing password assignment with the following for registration:

$hash = password_hash($password, PASSWORD_DEFAULT);

This creates a hashed password using bcrypt, the recommended algorithm in recent PHP versions.

For the login process:

$sql = "SELECT * FROM users WHERE username = ?";
$stmt = $dbh->prepare($sql);
$result = $stmt->execute([$_POST['username']]);
$users = $result->fetchAll();
if (isset($users[0]) {
    if (password_verify($_POST['password'], $users[0]->password) {
        // Valid login
    }
} else {
    // Invalid username
}

By utilizing libraries and implementing proper password hashing, you significantly increase the security of your code, preventing unauthorized access to user data.

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