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B: (A, {NA}KAB) A: {(NA+1, NB)}KAB B: {NB+1}KAB AR ΔΙΔ VAR

B: (A, {NA}KAB) A: {(NA+1, NB)}KAB B: {NB+1}KAB AR ΔΙΔ VAR

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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Mutation and Type-Flaw Attacks Consider the following 4-message protocol between A and B, where (N+1) represents the increment of the number N: 1. A B: (A, {NA}KAB) 2. B A: {(NA+1, NB)}KAB B: {NB+1}KAB 3. A → 4. B A: {(K'AB, NA)}KAB Which one of the following mutations to messages of the protocol above would constitute a harmful attack? a) A → B: (C, {NA}KAB) b) 1. A c) 4. B d) 4. B e) 3. A f) 2. B → → B: ({NA}KAB, A) A: {(KAB, NA)}KAB A: {(K'AB, NB+1)}KAB B: {NB+1}KpbB A: {(NA+1, NA)}KAB
Transcribed Image Text:Mutation and Type-Flaw Attacks Consider the following 4-message protocol between A and B, where (N+1) represents the increment of the number N: 1. A B: (A, {NA}KAB) 2. B A: {(NA+1, NB)}KAB B: {NB+1}KAB 3. A → 4. B A: {(K'AB, NA)}KAB Which one of the following mutations to messages of the protocol above would constitute a harmful attack? a) A → B: (C, {NA}KAB) b) 1. A c) 4. B d) 4. B e) 3. A f) 2. B → → B: ({NA}KAB, A) A: {(KAB, NA)}KAB A: {(K'AB, NB+1)}KAB B: {NB+1}KpbB A: {(NA+1, NA)}KAB
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