Which two steps does a receiver perform to validate a message using HMAC？ （）
A. decrypts the received MAC using a secret key
B. compares the computed MAC vs. the MAC received
C. authenticate the receivedmessage using the sender’s public key
D. look up the sender’s public key
E. extracts the MAC from the receivedmessage thenencrypts the received message with a secret keyto producethe MAC
F. Computes the MAC using the receivedmessage and a secret key as inputs to the hash functio
识别项目风险的方法有专家调查法、头脑风暴法、复合指数法、情景分析法、面谈法。
A. 正确
B. 错误
提高计算机的可靠性方法：一种是直接采用（）计算机；另一种就是采用（）计算机。
A. 工业控制，容错
B. 专业，个人
C. 超级，网络
D. 模拟，数字
恐惧广告常用于公益广告中，广告的效果和受众对广告的记忆度与恐惧的强度成正比。
A. 正确
B. 错误
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