问题：
[多选题]4. Which of the following are valid characterizations of key encryption protocols? (Choose all that apply.)下面哪些是密钥加密协议的有效特点?(选出所有满足条件的答案)
A.Asymmetric 非对称
B.Bidirectional 双向
C.Symmetric 对称
D.One-Way 单向
[多选题]4. Which of the following are valid characterizations of key encryption protocols? (Choose all that apply.)下面哪些是密钥加密协议的有效特点?(选出所有满足条件的答案)
A.Asymmetric 非对称
B.Bidirectional 双向
C.Symmetric 对称
D.One-Way 单向
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