單項選擇題

Which of the following is true about Kerberos?以下哪一個是關(guān)于Kerberos的描述是正確的?()

A.It encrypts data after a tickt is granted,but passwords are exchanged in plaintext.它在ticket獲得授權(quán)后對數(shù)據(jù)進行加密,但是密碼的交換是明文方式。
B.It depends upon symmetric ciphers.它依賴于對稱加密。
C.It is a second party authentication system.它是一種第二方的認證系統(tǒng)
D.It utilizes public key cryptography.它使用公鑰密碼學(xué)。

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