Answer (Choose 2 answers)
Which of the following violate Kerckhoff's principle?
A. A company states that its system is "secure" because it uses confidential and proprietary protocols
B. The company password is written using an invisible ink, and only the people within the company know the fact that invisible ink is used
C. The attacker has the copy of the system
D. The algorithms for popular symmetric ciphers such as DES and AES are publicly known
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