Computer Science. cryptology Please answer each and label each answer by alphabe

Question

Computer Science. cryptology Please answer each and label each answer by alphabet A. Explain precisely how and where Alice is authenticated. What prevents a replay attack? B. If Trudy is a passive attacker (i.e., she can only observe messages), she cannot determine the key K. Why? C. Show that if Trudy is an active attacker (i.e., she can actively send messages) and she can impersonate Bob, then she can determine the key K that Alice uses in the last message. Explain why this does not break the protocol. d. What is the purpose of the encrypting the final message with the key K?

Explanation / Answer

A)The Alice is authenticated in Bob side when the message is sent to Bob.and the authentication protocol is used to authenticate.

C)in active attack she can modify the encrypted message.so she can find the key from the ciphertext and original text.and k key is used in Alice side

B)In passive attack intruder only read the message that is transmitted.and she cannot find the key from the encrypted message.in this the key find is very difficult

D)the final message is encrypted by the K key.it is used for the purpose of getting security from unauthorized person.it used to difficult find the key

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