[Standards] Synchronizing encryption keys accross different resources

Greetings. Suppose that I want to access to data over PubSub which is encrypted with OpenPGP. I then would have the GPG key in order to access to that data. Should the key be also stored over a PubSub node and then be synchronized to resources that request it? What would be a good practice to do it? My use-case is of an annotation system which is based on Atom Over XMPP. Reference: https://forum.palemoon.org/viewtopic.php?f=5&t=31900 Regards, Schimon