olemus
šifri salastamine ei suurenda turvalisust, st
krüptograafiline süsteem peab jääma turvaliseks ka siis,
kui tema kohta on teada kõik peale krüptovõtme;
sõnastas hollandi keeletadlane ja krüptograaf
Auguste Kerckhoffs, 1883

Wiktionary:
(cryptography) the idea that a cryptosystem should be designed to be secure even if everything about the system, except the secret key, is public knowledge

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

https://en.wikipedia.org/wiki/Auguste_Kerckhoffs

https://www.rambus.com/blogs/a-modern-interpretation-of-kerckhoff/

https://crypto.stackexchange.com/questions/66162/if-kerckhoffs-principle-holds-why-do-we-need-a-cipher-at-all

https://en.wikipedia.org/wiki/Security_through_obscurity