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Which of these is one of the key principles of cryptology?
The security of an encryption algorithm should depend only on the secrecy of the key and not on the secrecy of the algorithm itself.
Only asymmetric encryption must be used in secure systems.
The security of an encryption algorithm should depend only on the secrecy of the algorithm and not on the secrecy of the encryption key.
The encryption algorithm must be always kept private.
Kerckhoff principle states that the security of an algorithm should depend only on the secrecy of the key and not on the secrecy of the algorithm itself - meaning that security by obscurity does not work. The other three options are not valid principles of cryptology.
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