You know.. encrypting memos with the 4th key is such an old feature.. I remember it was already old back when it was just STEEM.. ..and if you asked me without pointing out the issue, I'd be absolutely sure there's a nice simple UI for that in peakd (but not on hive.blog)..
..but it seems that it's not! :D after you wrote, I checked, and couldn't find it anywhere, I think I checked every nook and corner of peakd's user ui, and whoooa, nothing like that. I'm utterly surprised!
Whooops :D I just refreshed the page and noticed I already wrote about it heh :D