网络加密。为多个服务器配置数据

I need to encrypt sections of my web.config file for a client. Most of the references I've seen are to using aspnet_regiis to do the encryption. However, as far as I can see, this needs to happen on the web server which will host the site, which means the encrypted values will be different for each server. I don't have access to this client's servers. I found a passing reference to the possibility of encryping the web.config data in a way that is portable across servers, but haven't found any more detailed information. Does anyone know how to do this?I need to encrypt sections of my web.config fil