How can one differentiate between a legitimate user and a Spambot when testing website security?

One way to differentiate between a legitimate user and a Spambot when testing website security is by implementing CAPTCHA verification. CAPTCHA requires users to complete a challenge that is easy for humans but difficult for bots, such as identifying distorted text or selecting specific images. This helps prevent automated bots from submitting forms or creating accounts on the website. 

// Check if the CAPTCHA code entered by the user is correct
if(isset($_POST['captcha']) && !empty($_POST['captcha'])){
    $userCaptcha = $_POST['captcha'];
    $realCaptcha = $_SESSION['captcha']; // Retrieve the CAPTCHA code generated and stored in the session
    if($userCaptcha != $realCaptcha){
        // CAPTCHA code entered by the user is incorrect, likely a Spambot
        // Handle the error or prevent form submission
    } else {
        // CAPTCHA code entered by the user is correct, proceed with form submission
    }
} else {
    // CAPTCHA code not entered by the user, likely a Spambot
    // Handle the error or prevent form submission
}

Keywords

captcha honeypot IP address blocking user agent detection form validation

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