By Thomas Baigneres, Pascal Junod, Yi Lu, Jean Monnerat, Serge Vaudenay
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 information A C.I.P. Catalogue checklist for this publication is out there 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 will not be translated or copied in complete or partially with no the written permission of the writer (Springer Science+Business Media, Inc., 233 Spring road, 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 version, software program, or by means of related or assorted method now understand or hereafter built is forbidden. The use during this e-book of exchange names, emblems, carrier marks and comparable phrases, whether the are usually 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 united states
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Extra resources for A classical introduction to cryptography exercise book
These kind of keys are called "weak keys". Although we only computed lower bounds on the number of weak keys for both A511 and its variant, the huge difference between the two bounds (222 for the real A511 against 262 for its variant) suggests that the variant is much weaker. 51 Conventional Cryptography Solution 14 *A Variant of A511 II 1 Let Ti denote the value of the clocking tap of Ri just before it is clocked, for i = 1,2,3. We denote by P : the~probability ~ ~ that~ Ri ~ is shifted at the next clock, and P !
T . It reduces the number of wrong keys that are displayed because it is clearly more difficult to find a wrong key satisfying Ci = 3DESL(Pi) for i = 1 , . . ,t (with t > 1) than to find a wrong key such that C = 3DESz(P) (for only one pair). The total number of encryption/decryption steps that have to be performed is simply t times the number found in the first question (we assume that we always perform t times 3DES in the if statement of the algorithm). Therefore, this algorithm needs 3 .
Moreover, the adversary will have the ability to choose the value of IV2 (the values of IV1 and IV3 are only known and fixed). The attack we will consider is described in Algorithm 3. ",6;)) the the corresponding plaintext. ith chosen ciphertext and P(" = (Pii), Similarly, denote the ith chosen value for IV2. 7. Attacking the CBCICBC-'ICBC-' mode of operation 1 Give an approximation of the complexity of Algorithm 3. $, lent to the condition P:" = P?. IVY) in Algorithm 3. )equiva- 4 Deduce an attack that recovers the value of K3.
A classical introduction to cryptography exercise book by Thomas Baigneres, Pascal Junod, Yi Lu, Jean Monnerat, Serge Vaudenay