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6. Consider the exchange between Alice and Bob shown in Figure 4 that Oscar can eavesdrop. After this exchange, Alice and Bob decide to use

6. Consider the exchange between Alice and Bob shown in Figure 4 that Oscar can eavesdrop. After this exchange, Alice and Bob decide to use EkAB(N+1) as the session key for encrypting communications. How can Oscar decrypt this communication without breaking the encryption scheme? Hint: Assume that Oscar can masquerade as Bob to Alice the next time she tries to connect to Bob.
am Alice Alice* Bob KAB(N)

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