212-81 practice question 16 of 30

What is Kerchoff's principle?

Full set: 206 questions
Answer options
A: A minimum of 15 rounds is needed for a Feistel cipher to be secure
B: Only the key needs to be secret, not the actual algorithm Correct answer
C: Both algorithm and key should be kept secret
D: A minimum key size of 256 bits is necessary for security
Correct Answer:
B. Only the key needs to be secret, not the actual algorithm
Explanation

Only the key needs to be secret, not the actual algorithm https://en.wikipedia.org/wiki/Kerckhoffs%27s_principle Kerckhoffs's principle of cryptography was stated by Netherlands born cryptographer Auguste Kerckhoffs in the 19th century: A cryptosystem should be secure even if everything about the system, except the key, is public knowledge.

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