This question already has an answer here:
I just read https://space.stackexchange.com/questions/37980/does-the-voyager-team-use-a-wrapper-fortran77-to-python-to-transmit-current and it struck me: how does NASA prevent satellites like this to be hi-jacked? Any security protocol designed in the 70s should be broken by now, shouldn't they? Furthermore, the CPU and storage capacity of a 70s satellite should be too limited to apply some modern algorithm?
Or are they relying on obscurity: no one else has the means to build the large enough satellite dishes required to communicate with crafts this far away?
Edit: I don't need to edit it, this is very different from the linked question. You can't prove non-existence so if you claim that they are similar, you have the burden of proof.