What are the potential security risks of using a simple username and password authentication system in PHP?

Using a simple username and password authentication system in PHP can pose security risks such as brute force attacks, password guessing, and credential stuffing. To mitigate these risks, it is recommended to implement additional security measures such as using strong password hashing algorithms, implementing account lockout mechanisms, and enforcing password complexity requirements. 

// Implementing password hashing with bcrypt
$password = 'password123';
$hashed_password = password_hash($password, PASSWORD_BCRYPT);

// Verifying hashed password
$entered_password = 'password123';
if (password_verify($entered_password, $hashed_password)) {
    echo 'Password is correct';
} else {
    echo 'Password is incorrect';
}

Keywords

SQL injection password hashing session hijacking cross-site scripting brute force attack

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