on Consider the following protocol designed so that X and Y will decide on fresh secret...

 

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on Consider the following protocol designed so that X and Y will decide on fresh secret key Kf. It is assumed that they have previously shared an initial key K'. X->Y: IDX, N1, where N1 is a nonce and IDX is the ID for X. Y-> X: E(KI, [N1, KF ]) X->Y: E(KF, N1) Answer the following questions: 1. Why would X and Y believe that they share a fresh new key after the protocol runs? ( 2 Points) 2. Show how an adversary, Z, can intercept a protocol run that X initiated using reflection to make X falsely believes that it has exchanged a new fresh key with Y. (4 Points) on Consider the following protocol designed so that X and Y will decide on fresh secret key Kf. It is assumed that they have previously shared an initial key K'. X->Y: IDX, N1, where N1 is a nonce and IDX is the ID for X. Y-> X: E(KI, [N1, KF ]) X->Y: E(KF, N1) Answer the following questions: 1. Why would X and Y believe that they share a fresh new key after the protocol runs? ( 2 Points) 2. Show how an adversary, Z, can intercept a protocol run that X initiated using reflection to make X falsely believes that it has exchanged a new fresh key with Y. (4 Points)

Answer rating: 100% (QA)

In our given example the two parties X and Y already share a key Ki They then wish to share a fresh secret key Kf 1 Why would X and Y believe that the... View the full answer