What is Kerchoff’s principle?

What is Kerchoff’s principle?
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
C. Both algorithm and key should be kept secret
D. A minimum key size of 256 bits is necessary for security

View Answer

Answer: B

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.