Did you mean Kerckhoffs's principle ("a cryptosystem should be secure even if everything about the system, except the key, is public knowledge")? Instead of Sc

Did you mean Kerckhoffs's principle ("a cryptosystem should be secure even if everything about the system, except the key, is public knowledge")? Instead of Schneier's Law ("any person can invent a security system so clever that she or he can't think of how to break it").