(3) 檢查憑證是否有效
(A)憑證撤鎖清單
(B)公開金鑰
(C)私密金鑰
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統計: A(371), B(10), C(13), D(0), E(0) #2161296
統計: A(371), B(10), C(13), D(0), E(0) #2161296