How to encrypt a single key in the appsettings section of web.config file using aspnet_regiis.exe

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ASP.NET4

Encrypt a single key in the appsettings section of web.Config file using Aspnet_regiis.exe.

<appsettings>

<add key="initialConnection" value="data source=db;User Id=User;pwd=pass;Initial Catalog=SECURITY" />

<add key="initialKey" value="xxx" />



Want to encrypt only key="initialConnection" .

Please help.

What I have tried:

aspnet_regiis -pef "appSettings" "C:\Users\Think\Desktop\RND1"