众所周知，web.config可以存储包括数据库链接在内的众多信息，所以为配置文件加密有时候就显得必要了。

1.加密前的配置文件如下:

 

1 
        2  3 
      
         4   
       
          5     
          7   
         8   
       
          9     
         10     
         11   
        12 13   
       
         14     
         15     
         16     
         18   
        19 20   
       
         21     
         22   
        23 
      

2.加密

(1)前端源代码

 

1  
      
         2     
       
          3         
          4         
        
           5             
         
          connectionStrings
           6             
         
          appSettings
           7             
         
          system.web/machineKey
           8             
         
          system.web/sessionState
           9         
         10         
        
 11         
        
 12         
         14         
         16     
       
 17     
      

 

(2)后台代码

 

1  private const string provider = "RSAProtectedConfigurationProvider";  //Use RSA Provider to encrypt configuration sections  2  3         protected void Page_Load(object sender, EventArgs e)  4         {
    5  6         }  7  8         protected void btnEncrypt_Click(object sender, EventArgs e)  9         {
   10             if (string.IsNullOrEmpty(this.ddlSection.SelectedValue)) 11             {
   12                 Response.Write("please select a configuration section"); 13                 //选择要加密的配置节点 14                 return; 15             } 16             //获取加密的配置节点 17             string sectionString = this.ddlSection.SelectedValue; 18             //使用指定的虚拟路径将 Web 应用程序配置文件作为 System.Configuration.Configuration 对象打开以允许读或写操作。 19             Configuration config = WebConfigurationManager.OpenWebConfiguration(Request.ApplicationPath); 20             ConfigurationSection section = config.GetSection(sectionString); 21             if (section != null) 22             {   //标记配置节点，进行保护 23                 section.SectionInformation.ProtectSection(provider); 24                 config.Save(); 25                 Response.Write("encrypt successed, please check the configuration file."); 26             } 27         } 28 29         protected void btnDecrypt_Click(object sender, EventArgs e) 30         {
   31             string sectionString = this.ddlSection.SelectedValue; 32 33             Configuration config = WebConfigurationManager.OpenWebConfiguration(Request.ApplicationPath); 34             ConfigurationSection section = config.GetSection(sectionString); 35             if (section != null && section.SectionInformation.IsProtected) 36             {
   37                 // 从关联的配置节中移除受保护的配置加密。 38                 section.SectionInformation.UnprotectSection(); 39                 config.Save(); 40                 Response.Write("decrypt success, please check the configuration file."); 41             } 42 43         }

(3)加密后的效果

      
      
       
        
         
         
          
           
           
           
            Rsa Key
            
           
           
           
            im7ZLO/++t/Iu7rVXYj7J0WvUH0cry6YgZXyY9FKE47TLBggiJPrSn+kVKBGPzSygH92ompVIhPWhJtqsTGJhdKuxRlQA5SrASmEvlB7ANo3chLoZOQbTzRyiCNFk3jOF7uoUykyFIqDPDZO9Tw9tW+iJ3LUYEhWyhOuz66GgQs=
            
           
          
         
         
         
          mCgroKV5diU9GnjPG7vNEBwtRLdA3h5P8NwkVFkUuS8jnV36dhJH0turxsHRQRFSIpxWQYOXz91yxEwuifCSfT2LBSw9ggE2gO/V1Ju/q/J+lfqFdHs2j1mXPbaiD4kXmcT+2i6UB+Cl8+ML0F+G6pru0ztoFAMS2otQovS8npFaGrNvv078wkYbfOPhIrjSHftgdBES48VXgcnILfFtGeF7BHAW1a36pInc9KWBA6H64orVuIRSGxTzZPxhaRrgsCANJbKRu3NX3q3o4vIfbQ4ugkrix9qG9UK4tcnhq5ytukEAaUJQe19Zb5onfDM54vG+Bd2Cggxs84Ie738LY/5qT8Gz0lS+
          
         
        
       
       
        
         
         
          
           
           
           
            Rsa Key
            
           
           
           
            Jb0l7McUq/QKBTtPJ75KALSPOchDYkOMxYqqSVVUGg9OEQ0reea1eU7lr4tL7XgYP+llKFD+/i1PCL0mWXUqSCVzK9aVWsjTcyQEGLRrBF0YXYwq3TOyn+Egl/ENxtAabCGcStimDs2SQOjPCkuD3k3uRXI/0+wXNNXAPRftXZ8=
            
           
          
         
         
         
          5/GgaNoruJPElBuKbq+ro5PlqcBECu7p1+3s+G3WzO5AGacgxDOJQvfQ6O33kEL3CLezhJ2/Nvzbq75lvvbnfSjCYXKcKVsk2LJADM5XAg61/U1v+0Ov1XlQ9WQKdyaepmTV5ccGRuHp94U4+JuJE/eXw2vJabkf
          
         
        
       
       
        
        
         
          
          
           
            
            
            
             Rsa Key
             
            
            
            
             K+G4c3VQgg7LtKZUuA5TS5h9Y8DWwdtudONFC9cgywGxedUEzcmnF0ise4XPv6F0Wx9pT6hwC2C+agHXPmVxupXKuonKXFsWWZ1edCXNzMuhzsoSyNcpkiWvk9lH5sXzHDhqeJbeAi5q5tf7nUKt8uoq5IjVpX/JoHHxmYzWfoM=
             
            
           
          
          
          
           yr+lyfRycdN7BU+uuWv5AF/radmLM2qLgyjgdLEJVurs9KijocEmI6GeoCG6SgIjPukMhY6jieo1LVbuEPb75g==
           
          
         
        
        
         
          
          
           
            
            
            
             Rsa Key
             
            
            
            
             iBNJ6+10cIZr9Cj9KJ8KEpRrQe2L/4KiIR9Vg51NyFURwhYZd4kjV0TeuALhUqtlpDImp4kCg+3X/FKp1dob8DiILTcLYY68JDIcUUgyVVwwijwqVTcDvEucmB+vRQAN7u3ivPrEdDpihjqfOh7GxODjB/PfLD5MwrAVxQAeqL0=
             
            
           
          
          
          
           Zb9wsQ+U9yPLlduYe7cQtzsXGF9do97y4iGCULOffGU+WgnIUAqVgOjrhTuNSiDnb9MYHXircQIrtkV9mqrqKvR++169uOrqtakZ3oK8ht8G8Qe2hhXv1EmNttGZvVOfsZmShlPXslWfOPDeHDV1oqhe/JEANw41RQ3KXot8eXCZjkdf/xkA5rkdixvtlmh9TleWTbnTq6LzrWwXUZXAR9UXybNE2ijG6ar+5a+05R6sgXEdgqNuV7RoFcbYba/zLffLkTBZ1YNvAbEfekuJTn018zOOX4x6v2bB2X3i7MsW9moROs0ld3UL0YOuqylS