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by marshray 3789 days ago
It's Kerckhoffs's 2nd principle:

"[The system] should not require secrecy, and it should not be a problem if it falls into enemy hands"

Which gives rise to the idea of "security though obscurity" is bad. A system is said to rely on obscurity if the bad guy learning any facts about it (other than the special secret keys) represents a compromise.

https://en.wikipedia.org/wiki/Kerckhoffs%27s_principle