How to prevent modification of javascript code

In recent years, with the development and popularization of Web technology, JavaScript has become an important member of the Web world. The emergence of JavaScript has greatly improved the interactivity and dynamics in web development. However, the openness of JavaScript also allows the JavaScript code in the page to be modified at will, or even maliciously tampered with. This makes page security a hot topic in the Web world.

In this article, we will explain how to use JavaScript to prevent modification of JavaScript code and ensure the security of the page.

Protection methods for JavaScript code

The protection of JavaScript code mainly includes the following aspects:

1. Confusion

Confusion is through Some methods are used to make JavaScript code less readable, thereby increasing the difficulty of the code. Obfuscation prevents others from easily modifying and viewing the injected script. The specific implementation can be completed through tools or code.

2. Encryption

The function of encryption is to convert JavaScript code into some unrecognizable characters, thereby preventing others from reading the code directly. The implementation of encryption can use some encryption algorithms, such as AES, DES, etc.

3. Tamper-proof

Page encryption is implemented through JavaScript code to ensure that key information on the page will not be tampered with. There are mainly the following methods:

(1) Add digital signature

Add a digital signature to the web page to protect the important data in the web page from being tampered with. The digital signature is generated by the web page author, encrypted with the public key, and then added to the web page. At the same time, it is also necessary to verify whether the digital signature is valid.

(2) Detect page modification

Detect whether the page has been maliciously tampered with. If the page is found to have been tampered with, the entire page can be cleared immediately and a system warning message will be displayed.

How to improve the security of JavaScript code?

1. Adopt modular design

Modular design can prevent developers from variable pollution in JavaScript code, thereby preventing hackers from injecting scripts to extract sensitive information. At the same time, modular design can increase the readability of the code and improve the maintainability of the code.

2. Limit the execution scope of JavaScript code

JavaScript code can be inserted anywhere on the page. In order to prevent the injection of hacker scripts, the execution scope of JavaScript code should be limited. The specific implementation method can be to use a safe JavaScript framework or limit the execution scope of JavaScript code in HTML.

3. Filtering user input

In web applications, user input often requires the use of JavaScript code, but the data entered by the user can easily be used by hackers. In order to reduce the danger caused by user input data, user input needs to be filtered. The specific implementation method can use regular expressions or HTML Encode.

4. Combine two or more technologies

The above methods are only the basic methods of JavaScript tamper-proofing. If using one method cannot achieve the expected effect, you can consider using two or a combination of methods. For example, using encryption and obfuscation technology at the same time, or using digital signature and page modification detection technology at the same time, to improve the security of JavaScript code.

Summary

In the Web world, JavaScript is an indispensable part, but the security of JavaScript code is also very important. In order to protect the security of web applications, the protection of JavaScript code is crucial. This article introduces some of the main JavaScript tamper-proof methods and provides some suggestions for improving the security of JavaScript code. Through these methods, the security of web applications can be effectively protected.

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