問題詳情
24. Suppose there are 16 users in the system, and they use symmetric encryption to achieveconfidential communication, how many keys need to be managed?
(A) 125
(B) 256
(C) 120
(D) 128
(E) 160
參考答案
用户評論
【Bryce Zoran】評論
任意兩個人要有1個 key, 所以是16取2, 16*15/2 = 120 隻key