question to crypto experts

[Robert J. Hansen]

> 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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