That's not part of any standard or spec, though. It's just where one implementation of SSH stores the keys. gpg-agent (which handles ssh keys when behaving as a

That's not part of any standard or spec, though. It's just where one implementation of SSH stores the keys. gpg-agent (which handles ssh keys when behaving as an SSH agent) stores them elsewhere. I imagine Putty and Filezilla do, too. It's possible that the storage format of the keys is not standard either, because I think I remember it being different between OpenSSH and Putty.