"Here's a lock and here's what inside it, but you still can't break it because you lack a separate secret of no mechanical relevance" is the only way to make a system secure. If it is possible at all, you WANT a system where knowledge of all the mechanics do not allow people to crack the safe.

See encryption. A secure crypto mechanism is not vulnerable to disclosure of its mechanism. The key is the secret. The mechanism is not. Having a secret mechanism that relies on its own secrecy means your main weakness is someone explaining how it works to the outside world.

RSA is perfectly well-known. So is rot13. rot13 is crap, disclosure or not. RSA is not as crap, disclosure or not.