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Julius Caesar didn't have number theory nor computers so his cypher was actually pretty sound.

We have a pretty good idea about the limits of encryption. I doubt advanced aliens would have much to laugh about our current state of our encryption systems.

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Considering that most people couldn't even read regular text back then it was definitely pretty sound, but that's not really my point.

We do? Got any references for that? Take RSA -- it's not even proven that breaking it is equivalent with integer factorization. Even if it was, there are no proof that integer factorization needs to be time consuming at all, there might very well exist an algorithm with polynomial complexity.

Do you really think that the last 30-40 years of crypto research represents the best we can have, given timespans of millions of years?

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