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How to prevent denial-of-repudiation attacks through PHP forms
How to prevent denial-of-repudiation attacks through PHP forms
With the development of Internet technology, we now often need to perform various form operations through the Internet, such as logging in, registering, submitting feedback, etc. If these form operations are not guarded against, they can easily be used by hackers to carry out malicious attacks. One of the attack methods is "molecule denial attack". This article will introduce how to prevent malicious denial attacks through PHP forms while ensuring the data security of user websites.
What is "element denial attack"?
"Molecular denial attack" refers to an attack method in which hackers use Web forms to submit malicious data to the backend, and then deny that they have submitted the data by tampering with or deleting relevant records. For example, a hacker performs malicious operations on a website, but they deny this behavior and claim that no such application was submitted. This is an "elementary denial attack."
Methods to prevent elemental denial attacks
Fortunately, we can prevent this kind of attack through some simple and effective methods. The methods are as follows:
- Confirm submission Human identity
In website forms, before collecting user data, it is recommended that users be forced to register and log in, so that the user's identity can be confirmed and the data is not submitted anonymously .
- Record the IP address and timestamp
After receiving the form submission, record the IP address and timestamp of the Web request, and when storing the submitted data, This information is stored together, which can help administrators quickly identify the authenticity of submitted data.
- Set the form verification code
Using the form verification code to confirm that the submitter is not only valid, but also can greatly reduce actor denial attacks. Form CAPTCHAs protect against automated attacks, such as bot or malware attacks.
- Connect to other services
You should connect to other services, such as SPAM checkers, digital signatures, or authentication for your app, to better identify attackers and Protect your data.
- Reasonable data verification
Before collecting user data, it is necessary to perform reasonable data verification on the data entered by the user, such as confirming the data type, length, and range. , format, etc., and must be verified again when storing data. This effectively prevents hackers from submitting malicious data and also prevents users from submitting incorrect data.
Use PHP forms to prevent denial-of-repudiation attacks
The above methods are relatively common, but when using PHP forms to prevent, we have an additional prevention method - use When Session stores data, it assigns a unique session ID. Using $_SESSION to manage form submission data can track the user's submission behavior, thereby effectively preventing denial-of-repudiation attacks.
The following is a sample code that uses a PHP form to prevent denial-of-repudiation attacks:
<?php
session_start();
if(!isset($_SESSION['user'])) {
$_SESSION['user'] = array();
}
if(isset($_POST['submit'])) {
$name = $_POST['name'];
$email = $_POST['email'];
$phone = $_POST['phone'];
$address = $_POST['address'];
$timestamp = time();
$ip = $_SERVER['REMOTE_ADDR'];
$session_id = session_id();
// 根据需要存储的表单数据，构建一个数组
$form_data = array('name' => $name, 'email' => $email, 'phone' => $phone, 'address' => $address, 'timestamp' => $timestamp, 'ip' => $ip, 'session_id' => $session_id);
// 存储表单数据到 $_SESSION 数组中
$_SESSION['user'][] = $form_data;
}
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Register Form</title>
</head>
<body>
<h1>User Registration Form</h1>
<form action="" method="post">
<label for="name">Name:</label>
<input type="text" name="name"><br>
<label for="email">Email:</label>
<input type="email" name="email"><br>
<label for="phone">Phone:</label>
<input type="text" name="phone"><br>
<label for="address">Address:</label>
<textarea name="address"></textarea><br>
<input type="submit" name="submit" value="Submit">
</form>
</body>
</html>This form stores each submitted data in the $_SESSION['user'] array, and uses session_id () function assigns a unique ID to each form data, which can better prevent molecular denial of attack.
Conclusion
Hacker attacks occur every moment, so it is very necessary and important to prevent elemental denial attacks. Through the above measures and sample codes, you can effectively prevent molecular denial-of-repudiation attacks in PHP form operations and protect the security of your user data.
The above is the detailed content of How to prevent denial-of-repudiation attacks through PHP forms. For more information, please follow other related articles on the PHP Chinese website!
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