Comparison of encrypted Git remote implementations (2017)
ptspts.blogspot.com
ptspts.blogspot.com
I also listen to `git-secrets`... but I don't know much more!
I had a look how keybase does it [1] but they don't say in that blog post. But in their post about encyrpted group chat and chat bots they do say there is a shred key for the group caht.