I'm sorry, you've lost me. I was responding to the claim that any man-made system was breakable. The most obvious example of a man-made system that is unlikely to be breakable in our lifetimes (so, I'll say, "ever") is SHA2. Then someone responded that SHA2 wasn't an interesting target. It doesn't have to be; it just has to be man-made, or concede the narrowing of the original claim.