加密web.config中的成员资格元素时出现问题

I am trying to encrypt the "system.web.membership" element within the Web.Config of our .Net application to secure username and password to Active Directory. I am using the aspnet_regiis command to encrypt, and have tried several different strings for the value of the "pe" option with no success. I have successfully encrypted the "connectstrings" element on my web.config.I am trying to encrypt the "system.web.membersh