What is an "encrypted descriptor?"
What are the pros and cons of using one?
In what version of Tor did they first become available?
Are they automatically used (i.e. default)? If not, how do you enable the use of one?
Note: The current Hidden Service design allows a single node to upload a descriptor to the set of applicable Hidden Service Directories. This descriptor describes how a client can establish a connection with the hidden service. I think that an encrypted descriptor would mean that only those with the decryption key could learn the details required to contact that hidden service. Does this feature exist?