Answered: Attacks on Security Protocols Consider…

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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Attacks on Security Protocols
Consider the following 4-message protocol:
1. A → S:(B, {(A, K1)}KpbS)
2. S → B:A
3. B → S:(A, {(B, K2)}KpbS)
4. S → A:(B, {K2}K1)
And the following attack trace:
1. I(A) → S: (B, {(A, K)}KpbS)
2. S → B: A
3. B → S: (A, {(B, K2)}KpbS)
4. S → I(A): (B, {K2}K)
Which one of these changes to the protocol messages would fix the attackthe attack then becomes impossible:
a) 3. B → S:(A, {(B, {K2}KpbA)}KpbS)
b) 4. S → A:(B, {K2, A}K1)
c) 2. S → B:{A}KpbB
d) 2. S → B:B
e) 3. B → S:(A, {(B, {K2}KprS)}KpbS)
f) 1. A → S:{(B, A, K1)}KpbS
g) 1. A → S:(A, {(B, K1)}K pbS)
h) 4. S → A:(B, {K1}K2)
i) 4. S → A:(A, B, {K2}K1)
j) 2. S → B:A, B
Explain your answer below:

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