In cryptography, Kerckhoffs's principle (also called Kerckhoffs's Desiderata, Kerckhoffs's assumption, axiom, or law) was stated by Auguste Kerckhoffs in the 19th century: A cryptosystem should be secure even if everything about the system, except the key, is public knowledge.
Kerckhoffs's principle was reformulated (perhaps independently) by Claude Shannon as "The enemy knows the system." In that form, it is called Shannon's maxim. In contrast to "security through obscurity," it is widely embraced by cryptographers.
Read more about Kerckhoffs's Principle: Origins, Explanation of The Principle, Applications, Security Through Obscurity
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“In some things, we Americans leave to other countries the carrying out of the principle that stands at the head of our Declaration of Independence.”
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