Consider the following 4-message protocol between A and B, where (N+1) represents the increment of N: 1. A → B: (A, {NA}KAB) 2. B → A: {(NA+1, NB)}KAB 3. A → B: {NB+1}KAB 4. B → A: {(K’AB, NA)}KAB Which of the following mutations to messages of the protocol above, would constitute a harmful attack a) 1. A → B: (C, {NA}KAB) b) 1. A → B: ({NA}KAB, A) c) 4. B → A: {(KAB, NA)}KAB d) 4. B → A: {(K’AB, NB+1)}KAB e) 3. A → B: {NB+1}KpbB f) 2. B → A: {(NA+1, NA)}KAB Explain your answer below:
Consider the following 4-message protocol between A and B, where (N+1) represents the increment of N:
1. A → B: (A, {NA}KAB)
2. B → A: {(NA+1, NB)}KAB
3. A → B: {NB+1}KAB
4. B → A: {(K’AB, NA)}KAB
Which of the following mutations to messages of the protocol above, would constitute a harmful attack
a) 1. A → B: (C, {NA}KAB)
b) 1. A → B: ({NA}KAB, A)
c) 4. B → A: {(KAB, NA)}KAB
d) 4. B → A: {(K’AB, NB+1)}KAB
e) 3. A → B: {NB+1}KpbB
f) 2. B → A: {(NA+1, NA)}KAB
Explain your answer below:
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Consider the following 4-message protocol between A and B, where (N+1) represents the increment of N:
1. A → B: (A, {NA}KAB)
2. B → A: {(NA+1, NB)}KAB
3. A → B: {NB+1}KAB
4. B → A: {(K’AB, NA)}KAB
Which of the following mutations to messages of the protocol above, would constitute a harmful attack
a) 1. A → B: (C, {NA}KAB)
b) 1. A → B: ({NA}KAB, A)
c) 4. B → A: {(KAB, NA)}KAB
d) 4. B → A: {(K’AB, NB+1)}KAB
e) 3. A → B: {NB+1}KpbB
f) 2. B → A: {(NA+1, NA)}KAB
Explain your answer below:
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