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Mutation and Type-Flaw Attacks

Mutation and Type-Flaw Attacks

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Mutation and Type-Flaw Attacks
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

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