Message encryption.

[dsoares]

Hi,

I saw the commits in project https://github.com/fredokun/cl-jupyter adding message encryption (see fredokun/cl-jupyter@4141a0a and fredokun/cl-jupyter@510aea1) and since i needed it for the maxima-jupyter kernel, i tried to apply the same changes in this project. Also added the key in defun send-input-request.
I was able to build the core image and put it to work with the current stable version of jupyterhub 0.2.0.

However, i'm a programmer but not a LISP or Maxima programmer (as a matter of fact, i do not know a single line of LISP...). So i ask you to verify the changes and see if they make sense to you.

I still have a problem dealing with inputs like "integrate (u^k, u)" (without the single quote operator); i think it's related to questions from Maxima to the user, via asksign. I'm sure i'm missing something... Please give me some feedback about this.

Thank you for the project.

[robert-dodier]

Hi, I've merged the pull request. I haven't tried the new code yet but I will soon. About questions caused by integrate(u^k, u) and other examples, these are supposed to be handled by input_request/input_reply in Jupyter -- the kernel discovers that it needs user input, sends a request to the front end, front end solicits user input, which it sends back to kernel. It was working OK when I was using the notebook interface, perhaps you can try that.