O *Untitled - NotepadFile Edit Format View Help2.1 Suppose that Bob and Alice have access to a public key system that makes their publickeys available to each other. KBrespectively. Each knows its own private key. Describe how Bob and Alice can use these keys soand KB + are Bob's private and public keys,that Bob can know that when he is communication with Alice that he is indeed communicating with Alice.Ln 9, Col 19100%Windows (CRLF)UTF-8

Bob has a key KB- (private key) and KB+ (public key) Bob publishes his public key KB+ and Alice…

Answered: 2.1 Suppose that Bob and Alice have…

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

Related questions

Question

Expert Solution

Step 1

Bob has a key KB- (private key) and KB+ (public key)
Bob publishes his public key KB+ and Alice retrieve it, then Bob mails his padlocks to Alice. (Padlock is a pair of lock have with Bob so that no one can access the keys and data except Alice).
Alice now generates a temporary symmetric key (suppose the key is P@T#R#) and uses Bob's public key to securely send it to Bob. Here, public keys would remain same and are accessible to both.
Bob then uses his KB- key to unlock his copy of P@T#R# keys.
Bob and Alice can then use those symmetric keys to securely send and receive messages . Here the mail client plays the vital role for Alice and the server play the vital role for connecting Bob.