Question: Explain why encryption is used in the second message (from Bob to Alice) in Figure 31.23, but signing is done in the third message (from

Explain why encryption is used in the second message (from Bob to Alice) in Figure 31.23, but signing is done in the third message (from Alice to Bob) in Figure 31.24.

Figure 31.23

Alice (claimant) Bob (verifier) A Encrypted with Alice's public key Rg A nonce sent by Bob Alice Bob, R 3 Rg

Figure 31.24

Alice (claimant) Bob (verifier) A Encrypted with Alice's public key Rg A

Alice (claimant) Bob (verifier) A Encrypted with Alice's public key Rg A nonce sent by Bob Alice Bob, R 3 Rg

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