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I don’t understand the math involved, but it does seem like it would be non-trivial to figure it out? Can you put in one giant number and get out another giant number and the fact that the second is convertible from the first is not readily apparent as far as I understand things.

Are we being fatuous about factoring and brute force (or in this case a light tap)?

There are many things in both Infosec and the real world that would fail if probed. My point is just that the same principle the encryption depends upon (inability to drive the key from the output) is the one that makes it not blindingly obvious when your keys are dangerously insecure.

I think this is legitimately a case of “no one put in place a process to check that the brain surgeon isn’t eating crayons” because why would you need to?

Anyway, the answer to your question is “April of last year.”