By Thomas Baigneres, Pascal Junod, Yi Lu, Jean Monnerat, Serge Vaudenay

ISBN-10: 0387279342

ISBN-13: 9780387279343

ISBN-10: 038728835X

ISBN-13: 9780387288352

TO CRYPTOGRAPHY workout publication 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 facts A C.I.P. Catalogue checklist for this booklet is on the market from the Library of Congress. A CLASSICAL creation TO CRYPTOGRAPHY workout publication by means of 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 entire or partially with out the written permission of the writer (Springer Science+Business Media, Inc., 233 Spring highway, big apple, big apple 10013, USA), apart from short excerpts in reference to reports or scholarly research. Use in reference to any type of info garage and retrieval, digital edition, software program, or via related or distinctive technique now understand or hereafter constructed is forbidden. The use during this booklet of alternate names, logos, provider marks and related phrases, no matter if the will not be pointed out as such, isn't really to be taken as an expression of opinion as to if or now not they're topic to proprietary rights. published within the united states.

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**Additional info for A Classical Introduction to Cryptography: Exercise Book**

**Example text**

1. Weak keys of DES Solution 2 Semi-Wea k Keys of DES First, note that it is possible to generate a DES decryption schedule on-the-fly. After k16 is generated, the values of C and D are equal to the original ones, since they both have been submitted to a 28-bit rotation. Thus, provided that one exchanges the left rotations with right rotations and the amount of the first rotation to 0 (instead of l), the same algorithm used to generate kl up to k16 can also generate the subkeys kls down to k l .

More details about cascade ciphers and their security can be found in [29]. 11. 11. 4) holds then 3: display K3 4: end if 5: end for it does not yield any wrong key (with high probability). Once ks is found, the adversary can peel the third layer off, and do a meet-in-themiddle attack on the last two layers. Note that we typically need both plaintext blocks A and B in order to eliminate wrong key candidates during the meet-in-the-middle. The complexity of this part of the attack is ~ ( 2 ' )in time and ~ ( 2 ' )in storage.

Give an approximate of the time and memory complexities. 2 Two-Key 3DES encrypts a 64-bit message M in the following manner. Here, K1 and K2 are strings of 56 bits each. (a) What is the average complexity of a "naive" exhaustive search? 1). We may use the box to encrypt plaintexts of our choice. build a table containing 19 Conventional Cryptography the standard DES decryption of the message 0 under all 256 keys. Then we use a chosen-plaintext attack to build a second table containing the 256 ciphertexts resulting from box encryptions of the elements of the first table.

### A Classical Introduction to Cryptography: Exercise Book by Thomas Baigneres, Pascal Junod, Yi Lu, Jean Monnerat, Serge Vaudenay

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