GitSync is basically just 1 applescript compiled as an app. In theory you can use GitSync without installing it. Security is handled through https and passwords are handled by apples own keychain. All code can be inspected here on github. DM me on twitter if you need help setting it up
And one more thing. GitSync really works. 26.000 commits and counting.
Live code on your iPad directly to GitHub and vice-versa
Ipad -> iCloud -> GitSync -> GitHub
GitHub -> GitSync -> iCloud -> Ipad
Save directly from your Mac to GitHub and vice-versa