hello,

i am not so sure. so far everything that is made by people can be cracked by people.

for some things you need brute force for other you need more thinking and less muscles.

example 1:

concrete

you can crack it with hammer. that is only one way. and it stands for hard to crack object.

example 2:

bank vault

there are also options for those to be cracked. you need a bit of planing, but it is not impossible.

example 3:

btc it self was cracked it self in early beginnings.


so far everything that has been made by human was cracked by some other human.
(for btc we are not sure if it has been or not cracked).

at least i am not aware of anything human made that has not been cracked.

best regards,
G