By Thomas Baigneres, Pascal Junod, Yi Lu, Jean Monnerat, Serge Vaudenay
TO CRYPTOGRAPHY workout ebook Thomas Baignkres EPFL, Switzerland Pascal Junod EPFL, Switzerland Yi Lu EPFL, Switzerland Jean Monnerat EPFL, Switzerland Serge Vaudenay EPFL, Switzerland Springer - Thomas Baignbres Pascal Junod EPFL - I&C - LASEC Lausanne, Switzerland Lausanne, Switzerland Yi Lu Jean Monnerat EPFL - I&C - LASEC EPFL-I&C-LASEC Lausanne, Switzerland Lausanne, Switzerland Serge Vaudenay Lausanne, Switzerland Library of Congress Cataloging-in-Publication info A C.I.P. Catalogue list for this e-book is on the market from the Library of Congress. A CLASSICAL advent TO CRYPTOGRAPHY workout e-book via Thomas Baignkres, Palcal Junod, Yi Lu, Jean Monnerat and Serge Vaudenay ISBN- 10: 0-387-27934-2 e-ISBN-10: 0-387-28835-X ISBN- thirteen: 978-0-387-27934-3 e-ISBN- thirteen: 978-0-387-28835-2 published on acid-free paper. O 2006 Springer Science+Business Media, Inc. All rights reserved. This paintings is probably not translated or copied in complete or partially with out the written permission of the writer (Springer Science+Business Media, Inc., 233 Spring road, big apple, manhattan 10013, USA), with the exception of short excerpts in reference to experiences or scholarly research. Use in reference to any kind of info garage and retrieval, digital variation, software program, or via related or distinctive technique now be aware of or hereafter constructed is forbidden. The use during this book of exchange names, emblems, provider marks and comparable phrases, no matter if the usually are not pointed out as such, isn't to be taken as an expression of opinion to whether or now not they're topic to proprietary rights. published within the united states
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Extra resources for A classical introduction to cryptography exercise book
5 Explain how this special mode is retro-compatible with 3DES: if an embedded system implements it, how can it simulate a 3DES device? Same question with DES: how is this special mode retro-compatible with DES? 6 Do you think that the new scheme is more secure than 3DES? Do you think that it is more secure than DES? 7 Let x and x' be two plaintexts, and let y = ExtDESK,llK2(x) and y' = ExtDESK,11K, (2') be the corresponding known ciphertexts. Explain how a smart choice of x and x' allows us to detect that we have u4 = uh and vq = vh simultaneously (here uh and vi are the internal intermediate values for computing y').
Let x and y be some fixed elements of (0, l I n . What is the probability that C*(x) = y? 2. A cascade of L block ciphers 24 EXERCISE BOOK variable. Assuming that EK roughly behaves like C*, compute an estimation of the amount of wrong keys displayed by Algorithm 2. How many wrong keys are displayed for a similar algorithm on a cascade of L ciphers? Assume that the adversary knows t plaintext/ciphertext pairs, all corresponding to the same key k . 3 Write an optimized algorithm, similar to Algorithm 2, which exploits these t pairs to reduce the number of wrong guesses.
9 Explain how to use this attack in order to reduce the security of ExtDES to the security of DES against exhaustive search? What can you say about the security of ExtDES now? D Exercise 8 Solution on page 40 Attack Against the OFB Mode Assume that someone sends encrypted messages by using DES in the OFB mode of operation with a secret (but fixed) IV value. 1 Show how to perform a known plaintext attack in order to decrypt transmitted messages. 2 Is it better with the CFB mode? 3 What about the CBC mode?
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