12. 下列何者為 Data Encryption Standard (DES)密碼金鑰的長度?
(A)32 bits
(B)56 bits
(C)64 bits
(D)128 bits
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統計: A(0), B(1), C(0), D(0), E(0) #3799343
統計: A(0), B(1), C(0), D(0), E(0) #3799343