Question: What is the role of the secret key added to the hash function in Figure 31.17 in the text (MAC)? Explain. Figure 31.17 Figure 31.17

What is the role of the secret key added to the hash function in Figure 31.17 in the text (MAC)? Explain.

Figure 31.17

Figure 31.17 Message authentication code Alice Bob M: Message K: A shared secret key MAC: Message authentication code K K МАС МАС Hash Hash Same?0 [no] M+ MAC Discard M + MAC Insecure channel M+ MAC [yes] Keep the message

Figure 31.17 Message authentication code Alice Bob M: Message K: A shared secret key MAC: Message authentication code K K Hash Hash Same?0 [no] M+ MAC Discard M + MAC Insecure channel M+ MAC [yes] Keep the message

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