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 information A C.I.P. Catalogue checklist for this booklet is offered from the Library of Congress. A CLASSICAL advent TO CRYPTOGRAPHY workout booklet by way 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 will not be translated or copied in entire or partly with no the written permission of the writer (Springer Science+Business Media, Inc., 233 Spring highway, ny, big apple 10013, USA), aside from short excerpts in reference to studies or scholarly research. Use in reference to any type of info garage and retrieval, digital variation, software program, or through comparable or numerous technique now comprehend or hereafter built is forbidden. The use during this e-book of alternate names, logos, provider marks and comparable phrases, no matter if the should not pointed out as such, isn't to be taken as an expression of opinion to whether or no longer they're topic to proprietary rights. revealed within the u . s . a ..
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Additional resources for A Classical Introduction to Cryptography: Exercise Book
D Solution on page 42 Conventional Cryptography Exercise 10 *Attacks on Cascade Ciphers In this exercise, we consider a block cipher of block length n and of key length e. The encryption function of the block cipher is denoted E. If P E (0, lIn denotes a plaintext and k E (0, is an encryption key, then Ek(P)= C E (0, lIn is the ciphertext obtained by encrypting P under the key k. We denote D the corresponding decryption function, such that Dk(Ek(P))= P for any plaintext P E (0, l j n and any key k E (0, A cascade cipher is the concatenation of L > 1 identical block ciphers with independent keys, denoted kl, .
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?
Each Ri compares the voting result with its own clocking tap. , the feedback for R1, R2, and RQ is EXERCISE BOOK 30 - the content of all cells in Ri (except the leftmost) are shifted to the left by one position simultaneously; - Ri[O] is updated by the precomputed feedback; I 18 13 0 8 R1 I LI I 21 output I 4 I 63 1:o - & tA ( I I I 1 I I I I I I I I I I I I / l I I I I R 2 I rn I I 22 LO 7 0 4 0 I I I I I l a u majority control I R3 . 8. A511 keystream generator 1 Show that when R1 is loaded with a special initial state, then, regardless of its movement in the future, its state never changes.
A Classical Introduction to Cryptography: Exercise Book by Thomas Baigneres, Pascal Junod, Yi Lu, Jean Monnerat, Serge Vaudenay