Question: 4 . This problem deals with the protocol in Figure 9 . 1 7 . 4 a ) Show that this protocol is insecure. Hint:

4. This problem deals with the protocol in Figure 9.17.
4a) Show that this protocol is insecure. Hint: Let Trudy be the man in-the-middle, and show that Trudy can convince Alice that she is Bob, and Trudy can determine Alices session key K.
4b) Slightly modify the protocol so that Trudy cannot obtain the session key.

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