ok, it's interesting, I wonder how they achieve it, but seems that it's safe!
https://en.wikipedia.org/wiki/Kerckhoffs%27s_principle
If you design the system from the ground up with the assumption the attacker gets to choose everything except the key, that's a very very strong design. Compared to that, the situation of "the attacker gets to know some of the plaintext" is nothing at all.
Or, put simply:If you play the cryptosystem design game on hard mode, easy mode challenges like "resistant to known plaintext attacks" get overcome for free.
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