By Thomas Baigneres, Pascal Junod, Yi Lu, Jean Monnerat, Serge Vaudenay
TO CRYPTOGRAPHY workout e-book 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 checklist for this publication is offered from the Library of Congress. A CLASSICAL advent TO CRYPTOGRAPHY workout publication through 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 no the written permission of the writer (Springer Science+Business Media, Inc., 233 Spring road, ny, manhattan 10013, USA), with the exception of short excerpts in reference to reports or scholarly research. Use in reference to any type of info garage and retrieval, digital version, software program, or through comparable or multiple technique now understand or hereafter constructed is forbidden. The use during this book of exchange names, logos, provider marks and related phrases, no matter if the are usually not pointed out as such, isn't really to be taken as an expression of opinion as to if or no longer they're topic to proprietary rights. revealed within the us of a.
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Additional info for A Classical Introduction to Cryptography: Exercise Book
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Lent to the condition P:" = P?. in Algorithm 3. )equiva- 4 Deduce an attack that recovers the value of K3. Once K3 is found, how can K1 and K2 be recovered? What is the overall complexity of the attack? " - D Exercise 13 Solution on page 47 *A Variant of A511 I In stream ciphers, the prevailing encryption is a bitwise XOR operation between the m-bit plaintext and the m-bit keystream which is the output of a so-called keystream generator fed by the L-bit secret key, where m is much larger than !.
1 For i = 1,2,3, what is the probability that Ri is shifted at the first clock? What is the probability that it is not shifted? 2 What is the probability that exactly two LFSRs are shifted at the first clock? 3 What is the probability mass function for the movement of three LFSRs at the first clock? 4 What is the conditional probability mass function of the first clocking given the initial clocking? We define the minority function between three binary bits a , b, c by minority(a, b, c ) = ifa=b=c a @ b @ c otherwise.
Therefore, its time complexity is 0 ( 2 ~ / ~ ) . 12. We assume that P,(")= some i # j . 7). 7) again, we A2(4- A,(d. 8) we conclude that 3 As IV1 is constant, 4 Algorithm 10 recovers K3 in 2k time complexity. Once K3 is found, the adversary can peel the third layer off and mount a meet-in-themiddle attack on the first two layers. 9) holds then 2: 3: display K3 4: end if 5: end for attack is 0 ( 2 ~ )in time, ~ ( 2 ' )in storage, and needs ~ ( 2 ~ chosen 1 ~ ) ciphertexts. A detailed study of cryptanalysis of multiple modes of operation can be found in [3, 41.