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  • Product recommendations are off topic here, unfortunately - they tend to go out of date very quickly. Commented Jun 6, 2017 at 15:16
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    Even if not a product recommendation, I could use some help with the vocabulary I need to inquire about this effectively. I don't even know what to google for at this point. Commented Jun 6, 2017 at 15:19
  • I'll edit the question to avoid asking for product recommendations Commented Jun 6, 2017 at 15:19
  • Firstly, it might be cheaper to just box the cable in with something as secure as needed to mitigate the potential threat you feel you face... But failing that how about a router at each end of the cable run with a IPSec tunnel setup? Commented Jun 6, 2017 at 16:17
  • @DrewShafer Thank you - that's much better. Questions of "how can I do x?" are generally more helpful for longer and to more people than ones of "what products let me do X?", so the edited question is more likely to get useful answers Commented Jun 6, 2017 at 16:35