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Consider the following 4-message protocol between A and B, where (N+1) represents the increment of N: A → B: (A, {NA}KAB) B → A: {(NA+1, NB)}KAB A → B: {NB+1}KAB 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

Consider the following 4-message protocol between A and B, where (N+1) represents the increment of N: A → B: (A, {NA}KAB) B → A: {(NA+1, NB)}KAB A → B: {NB+1}KAB 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

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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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:

  1. a) 1. A → B: (C, {NA}KAB)
  2. b) 1. A → B: ({NA}KAB, A)
  3. c) 4. B → A: {(KAB, NA)}KAB
  4. d) 4. B → A: {(K’AB, NB+1)}KAB
  5. e) 3. A → B: {NB+1}KpbB
  6. f) 2. B → A: {(NA+1, NA)}KAB
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