Comment on
Can you hide wired conversations behind a language barrier?
They just get a translator, and you're screwed. No amount of complexity between any two real, actual languages will make this "good" encryption. That definitely includes Japanese, most of whose quirks you could get lectured on by any teenager with a passing interest in weeb culture. What you want is encryption, ideally something that can pass below the radar, languages don't do that. Even the hardest, clusterfuckiest of constructed languages don't do that.