In the public-key authentication protocol of Fig. 8-40 , inmessage 7, is encrypted with . Is this encryptionnecessary, or would it have been adequate to send it back inplaintext? Explain your answer. 1. Give me Eg2. Here is EgAlice63DirectoryEB (A, RA)EA (RA, RB, KS)7Ks (RB)4. Give me EA5. Here is EABobFigure 8-40Mutual authentication using public-key cryptography.

Public -Key cryptography:- Public key cryptography uses a pair of keys a public key and a private…

Answered: In the public-key authentication…

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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In the public-key authentication protocol of Fig. 8-40 , in
message 7, is encrypted with . Is this encryption
necessary, or would it have been adequate to send it back in
plaintext? Explain your answer.

1. Give me Eg
2. Here is Eg
Alice
6
3
Directory
EB (A, RA)
EA (RA, RB, KS)
7
Ks (RB)
4. Give me EA
5. Here is EA
Bob
Figure 8-40
Mutual authentication using public-key cryptography.

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