Cryptanalysis is the process of analyzing cipher text and finding weaknesses in cryptographic algorithms. These weaknesses can be used to decipher the cipher text without knowing the secret key. Answer: C is incorrect. Kerberos is an industry standard authentication protocol used to verify user or host identity. Kerberos v5 authentication protocol is the default authentication service for Windows 2000. It is integrated into the administrative and security model, and provides secure communication between Windows 2000 Server domains and clients. Answer: A is incorrect. A cryptographer is a person who is involved in cryptography.

Answer: B is incorrect. Cryptography is a branch of computer science and mathematics. It is used for protecting information by encoding it into an unreadable format known as cipher text.