What's a symmetric cipher from the 70s that we can't brute force today?
(And I'm not counting "the idea" of 3DES when even that was after voyager already launched and it wasn't properly set up until 1981. Also 3DES has enough weaknesses that I wouldn't trust it to be uncrackable today.)
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Why would you use public key encryption here in the first place? Just use a symmetric cipher.
What's a symmetric cipher from the 70s that we can't brute force today?
(And I'm not counting "the idea" of 3DES when even that was after voyager already launched and it wasn't properly set up until 1981. Also 3DES has enough weaknesses that I wouldn't trust it to be uncrackable today.)