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

Bob does the same now they both know that the other

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Unformatted text preview: ypts the key in step (10) is the key revealed. If you use RSA, this protocol leaks information at the rate of one bit per message. It’s the quadratic residues again. If you’re going to distribute keys in this manner, make sure this leakage isn’t enough to matter. Also, the stream of keys from the KDC must be great enough to preclude a brute-force attack. Of course, if Alice can’t trust the KDC, then she shouldn’t be getting keys from it. A malicious KDC could presumably keep records of every key it generates. Then, it could search them all to determine which is Alice’s. This protocol also assumes that Alice is going to act fairly. There are things she can do, using RSA, to get more information than she might otherwise. This is not a problem in our scenario, but can be in other circumstances. 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 ----------- 4.12 One-Way Accumulators Alice is a member of Cabal, Inc. Occasionally she has to meet with other members in dimly lit restaurants and whisper secrets back and forth. The problem is that the restaurants are so dimly lit that she has trouble knowing if the person across the table from her is also a member. Cabal Inc. can choose from several solutions. Every member can carry a membership list. This has two problems. One, everyone now has to carry a large database, and two, they have to guard that membership list pretty carefully. Alternatively, a truste...
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This note was uploaded on 10/18/2010 for the course MATH CS 301 taught by Professor Aliulger during the Fall '10 term at Koç University.

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