By Thomas Baigneres, Pascal Junod, Yi Lu, Jean Monnerat, Serge Vaudenay
TO CRYPTOGRAPHY workout booklet 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 out there from the Library of Congress. A CLASSICAL advent TO CRYPTOGRAPHY workout ebook 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 revealed 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 highway, manhattan, manhattan 10013, USA), with the exception of short excerpts in reference to stories or scholarly research. Use in reference to any type of info garage and retrieval, digital version, software program, or by means of comparable or assorted method now recognize or hereafter constructed is forbidden. The use during this e-book of alternate names, emblems, carrier marks and related phrases, whether the should not pointed out as such, isn't really to be taken as an expression of opinion to whether or now not they're topic to proprietary rights. revealed within the country.
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Extra resources for A Classical Introduction to Cryptography: Exercise Book
KN). , the correct key known by the oracle is ki (i E (1, . . ,N ) ) with probability Pr[K = ki]. Unless specified, K is not assumed to be uniformly distributed. , the probability that the cryptanalyst sends ki (i E (1,. . ,N ) ) to the oracle is P ~ [= Eki]. The cryptanalyst iteratively queries the oracle with randomly selected keys, in an independent way, until he finds the right one. Note that, as the queries are independent, the complexity could in principle be infinite (we say that the algorithm is memoryless).
4). lie lie. Note that two independent keys are used here, one in the CBC mode, the other in the CFB mode. , that the block length is larger than the key length) and that all the IV 's are known to the adversary. For simplicity, we denote Eki and Dki by Ei and Di respectively. 3. 4. 4. 5. We are going to mount a chosen plaintext attack against it. The plaintext P we choose, is the concatenation of three n-bit blocks such that P = (A, A, B) (where A, B E (0, lIn denote arbitrary blocks of n bits).
The three rotors allow 263 = 17,576 different combinations. The plugboard allows different possibilities. 76. 1015. , one can encode the key with 51 bits. 3 An exhaustive search on a 51-bit key requires 250 attempts in average. Simon Singh's Code Book  is a good reference on the history of the Enigma machine. Chapter 2 CONVENTIONAL CRYPTOGRAPHY Exercises Exercise 1 Weak Keys of DES We say that a DES key k is weak if DESk is an involution. Exhibit four weak keys for DES. Reminder: Let S be a finite set and let f be a bijection from S to S.
A Classical Introduction to Cryptography: Exercise Book by Thomas Baigneres, Pascal Junod, Yi Lu, Jean Monnerat, Serge Vaudenay