Checkout this exploit tool I wrote for red teaming: https://github.com/TheRook/nsshell

Most notably nsshell doesn't even need the target to run python. I have written a bunch of exploit modules for it, and the only exploit modules that require python are the jinja2 template injection modules. (https://github.com/TheRook/nsshell/blob/master/nsshell/loade...)

I like your encryption protocol, I might adopt it.