Detailed explanation of simple encryption and decryption of HTML, JS, and strings

1. The simplest encryption and decryption

Use escape and unescape to encode and decode strings. For example, "Hello" becomes "%u4F60%" after encryption. u597D", don’t you understand? If it is encrypted js, it can be decrypted and executed using the eval function at runtime.

Disadvantages: Numbers and English cannot be encrypted, and everyone knows the decryption method.

2. Self-written decryption function method

// 加密函数function compile(code)  {    
   var c=String.fromCharCode(code.charCodeAt(0)+code.length);  
   for(var i=1;i<code.length;i++){  
       c+=String.fromCharCode(code.charCodeAt(i)+code.charCodeAt(i-1));  
   }  
   return escape(c);  
}  
// 解密函数function uncompile(code)  {  
   code=unescape(code);  
   var c=String.fromCharCode(code.charCodeAt(0)-code.length);  
   for(var i=1;i<code.length;i++){  
       c+=String.fromCharCode(code.charCodeAt(i)-c.charCodeAt(i-1));  
   }  
   return c;  
}

3. Other encryption methods

Use the script encoder Script Encoder produced by Microsoft to encode, add spaces, slashes, Tab and other characters to confuse the encoding... These encodings don't feel very elegant, so I won't go into them. . .

4.DES, AES, RSA, Base64, MD5, CHA1 encryption

Search for these professional encryption methods by yourself...

1.The simplest encryption and Decryption

Use escape and unescape to encode and decode strings. For example, "Hello" becomes "%u4F60%u597D" after encryption. You can't understand it. If it is encrypted js, it can be decrypted at runtime. Use the eval function to execute.

Disadvantages: Numbers and English cannot be encrypted, and everyone knows the decryption method.

2. Self-written decryption function method

// 加密函数function compile(code)  {    
   var c=String.fromCharCode(code.charCodeAt(0)+code.length);  
   for(var i=1;i<code.length;i++){  
       c+=String.fromCharCode(code.charCodeAt(i)+code.charCodeAt(i-1));  
   }  
   return escape(c);  
}  
// 解密函数function uncompile(code)  {  
   code=unescape(code);  
   var c=String.fromCharCode(code.charCodeAt(0)-code.length);  
   for(var i=1;i<code.length;i++){  
       c+=String.fromCharCode(code.charCodeAt(i)-c.charCodeAt(i-1));  
   }  
   return c;  
}

3. Other encryption methods

Use the script encoder Script Encoder produced by Microsoft to encode, add spaces, slashes, Tab and other characters to confuse the encoding... These encodings don't feel very elegant, so I won't talk about them. . .

4.DES, AES, RSA, Base64, MD5, CHA1 encryption

You can search for these professional encryption methods on the php Chinese website.

Related recommendations:

A simple encryption method for passwords

A simple encryption and decryption code for php_PHP tutorial

php Simple encryption/decryption class

The above is the detailed content of Detailed explanation of simple encryption and decryption of HTML, JS, and strings. For more information, please follow other related articles on the PHP Chinese website!