From the series "let's end the dialogue, but the last word is mine":D
Okay, don't answer, but I'll have my say. This is a public place, and you're going to discuss some secret things here that are known to a small circle of people (and actually, only one person - Baratorch), and you're upset that someone asked you a question about something that wasn't clear to them.
And instead of explaining it to him, you shut him up...
It's just bad manners...

Added 9 minutes later
And yes, in advanced technologies, the security system is essentially ALWAYS open. Only the key should be closed! Hiding the encryption system is an indicator of its vulnerability.