I think you've got to reverse-engineer their protocol/data format before the issue of authentication even comes to light, it's naturally something layered on to

I think you've got to reverse-engineer their protocol/data format before the issue of authentication even comes to light, it's naturally something layered on top of that. I have to say Jeff Goldblum is way more convincing as a hyperintelligent but nerdy romantic lead than whoever they cast in Arrival.