Alice and Bob are strangers. Alice wants Bob to send her a private message A and be able to verify the integrity of the message. What should Bob do? (h() is a hash function and assume both Alice and Bob knows h(). Bob generates an encryption key k and relies on PKI to send Alice X, Y, H where Y=PubE(alice-pub,k), X-SymE(k,A), H=SymE(k,h(A)). This does not work because while Alice can read A, she cannot verify the integrity of the message This does not work because Bob cannot verify the public key of Alice This does not work because Alice cannot recover the encryption key k. This works

Alice and Bob are strangers. Alice wants Bob to send her a private message A and be able to verify the integrity of the message. What should Bob do? (h() is a hash function and assume both Alice and Bob knows h(). Bob generates an encryption key k and relies on PKI to send Alice X, Y, H where Y=PubE(alice-pub,k), X-SymE(k,A), H=SymE(k,h(A)). This does not work because while Alice can read A, she cannot verify the integrity of the message This does not work because Bob cannot verify the public key of Alice This does not work because Alice cannot recover the encryption key k. This works

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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