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applied cryptography - protocols, algorithms, and source code in c

For example alice is selling a car to bob a stranger

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Unformatted text preview: involved in the protocol accept what he says as true, what he does as correct, and that he will complete his part of the protocol. Arbitrators can help complete protocols between two mutually distrustful parties. Previous Table of Contents Next Products | Contact Us | About Us | Privacy | Ad Info | Home Use of this site is subject to certain Terms & Conditions, Copyright © 1996-2000 EarthWeb Inc. All rights reserved. Reproduction whole or in part in any form or medium without express written permission of EarthWeb is prohibited. Read EarthWeb's privacy statement. To access the contents, click the chapter and section titles. Applied Cryptography, Second Edition: Protocols, Algorthms, and Source Code in C (cloth) Go! Keyword Brief Full Advanced Search Search Tips (Publisher: John Wiley & Sons, Inc.) Author(s): Bruce Schneier ISBN: 0471128457 Publication Date: 01/01/96 Search this book: Go! Previous Table of Contents Next ----------- In the real world, lawyers are often used as arbitrators. For example, Alice is selling a car to Bob, a stranger. Bob wants to pay by check, but Alice has no way of knowing if the check is good. Alice wants the check to clear before she turns the title over to Bob. Bob, who doesn’t trust Alice any more than she trusts him, doesn’t want to hand over a check without receiving a title. TABLE 2.1 Dramatis Personae Alice Bob Carol Dave Eve Mallory Trent Walter Peggy Victor First participant in all the protocols Second participant in all the protocols Participant in the three- and four-party protocols Participant in the four-party protocols Eavesdropper Malicious active attacker Trusted arbitrator Warden; he’ll be guarding Alice and Bob in some protocols Prover Verifier Figure 2.1 Types of protocols. Enter a lawyer trusted by both. With his help, Alice and Bob can use the following protocol to ensure that neither cheats the other: (1) Alice gives the title to the lawyer. (2) Bob gives the check to Alice. (3) Alice deposits the check. (4) After waiting a specified time period for the check to clear, the lawyer gives the title to Bob....
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