Can javascript be encrypted?

Javascript can be encrypted; there is basically no need to encrypt general JavaScript code. Encryption will increase the size and affect the loading speed. If it is a sensitive business, the JavaScript code can be encrypted. When writing the business code, To design security issues, it is generally best to split the overall business. It is best to put the core computing business in the background, complicate the simple logic and then encrypt it.

The operating environment of this tutorial: Windows 10 system, JavaScript version 1.8.5, Dell G3 computer.

Javascript can be encrypted

Does JavaScript need to be encrypted?

1. General business JavaScript code, such as normal business JavaScript, basically does not need to be encrypted. Make a compressed variable name, method name, and overall compression. In order to reduce the size of JavaScript code , thereby speeding up loading. Encryption will increase the size. The more complex the encryption, the larger the code size will be.

2. If it is a sensitive business, it must be encrypted, but it is not just encryption. It does not mean that after writing the business code, it can be solved by encrypting it. That is to say, the overall design is required. .

What is the safest way to encrypt JS?

JS encryption is a routine. There is no safest JavaScript encryption, only the deepest routine. JavaScript No matter how you encrypt it, it needs to be recognized by the browser, and there is a decryption process. Therefore, JS encryption can still be decrypted in the end. Decryption is not equal to restoration, so no matter how you encrypt it, you can eventually restore it roughly. This is just a matter of time. Some people will panic when they see this, and they will say what is the meaning of encryption? ?

Then let me ask? Can DES symmetric encryption similar to the encryption used by the CIA be decrypted? I can definitely answer you, "yes", it is just a matter of time. As long as the encryption itself is reversible, it can be decrypted whether with a secret key or without a secret key. It is just a matter of time, one day, one month, one year, five years, ten years. Years, a hundred years, can always be decrypted because the code itself is reversible.

Summary:

When writing business code, security issues must be considered. Generally, it is best to split the overall business. The core computing business is best placed in the background, rather than loaded. Don’t put the core code on the front end for many times. Complicate simple code. Complicate simple logic and encrypt it.

How to hide the URL address and secret key in JS?

If there is a URL address in the JS code and you don’t want others to see it, encryption can solve it. But if you want to make it complicated, you need to make it complicated. Let’s look at an example.

//原来的代码
$.get("https://www.jsjiami.com/demo/load.js");


//人工复杂化
(function (a,b,c,d,e) {
    e = e || {
        e:'w'+'ww',
        j:'jsji'+'ami',
        a:'.co'+'m/d'+'emo/loa'+'d',
        c:'ht'+'tps://',
        d:'ge'+'t'
    };
    a[e?e.d:e](e.c+e.e+e.j+e.a+c+d);
})($,'g','.j','s');

Although it is easier to see without encryption, if this code is encrypted again, the effect will be much better than the source code. The same goes for secret keys.

In addition, you can obtain the secret key on page A, process the secret key on page B, and use the secret key on page C, which can be stored in cookies and cache/item.

What are the precautions for JavaScript encryption?

1. Try to use closures, like JQuery. Called using a global variable assignment closure. If the JS that needs to be encrypted is multiple JS dependent calls, then the method name or variable name may be encrypted and modified to something else, so the method name or variable name may be undefined.

2. The encrypted JS code cannot contain other language codes, such as PHP, Java and other codes. If you don’t understand why, please first understand the order in which JS/PHP and other codes run.

3. Don’t omit “;”, “{ and }” in the encryption code. There are explanations in the best encryption.

【Related recommendations: javascript video tutorial, web front-end】

The above is the detailed content of Can javascript be encrypted?. For more information, please follow other related articles on the PHP Chinese website!