Introduction:
In this article,i am going to explain about how to encrypt and decrypt web.config entries using asp.net.

Main:
We can encrypt and decrypt web.config entries in the following two ways,

1.WebConfiguration Class,

Using System.Web.Configuration;   For Encryption AppSettings,   Configuration local_config = WebConfigurationManager.OpenWebConfiguration(HttpContext.Current.Request.ApplicationPath); ConfigurationSection local_section = config.GetSection(appSettings); if (!local_section.SectionInformation.IsProtected) { if (!local_section.ElementInformation.IsLocked) { string local_encMethod = encryptionProvider.ToString(); local_section.SectionInformation.ProtectSection("RsaProtectedConfigurationProvider"); local_config.Save(ConfigurationSaveMode.Full); } }   For Decrypt AppSettings,   Configuration local_config = WebConfigurationManager.OpenWebConfiguration(HttpContext.Current.Request.ApplicationPath); ConfigurationSection local_section = config.GetSection(appSettings); if (local_section.SectionInformation.IsProtected) { if (!local_section.ElementInformation.IsLocked) { local_section.SectionInformation.UnprotectSection(); local_config.Save(ConfigurationSaveMode.Full); } }

2.Using aspnet_regiis Command line tool,

For Encrypt, C:\>aspnet_regiis -pe "appSettings" -app "/YourAppVirtualDir" -prov "RsaProtectedConfigurationProvider"   For Decrypt, C:\>aspnet_regiis -pd "appSettings" -app "/YourAppVirtualDir"

Conclusion:
Hope this helps,
Happy Coding.