In what situations would it be necessary to uniquely identify users without them being able to easily bypass the system?

One situation where it may be necessary to uniquely identify users without them being able to easily bypass the system is in a secure login system where users need to access sensitive information or perform important actions. To achieve this, one approach is to use session tokens in combination with user authentication to verify a user's identity and prevent unauthorized access. 

<?php
session_start();

// Generate a unique session token for the user
$token = bin2hex(random_bytes(16));

// Store the token in the session
$_SESSION['token'] = $token;

// Verify the token on subsequent requests
if(isset($_SESSION['token']) && $_SESSION['token'] === $token) {
    // User is authenticated
    echo "User authenticated";
} else {
    // Invalid token, redirect user to login page
    header("Location: login.php");
    exit;
}
?>

Keywords

authentication session management user identification security measures anti-fraud techniques

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