git-extras:
https://github.com/tj/git-extras/blob/master/Commands.md

git-crypt:
https://www.agwa.name/projects/git-crypt/
https://github.com/AGWA/git-crypt

git-secret:
http://www.opennet.ru/tips/2969_git_pgp_crypt.shtml
https://sobolevn.github.io/git-secret/