Read e-book online A Classical Introduction to Cryptography Exercise Book PDF

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

ISBN-10: 038728835X

ISBN-13: 9780387288352

This spouse workout and answer e-book to A Classical creation to Cryptography: functions for Communications Security features a conscientiously revised model of educating fabric. It used to be utilized by the authors or given as examinations to undergraduate and graduate-level scholars of the Cryptography and safeguard Lecture at EPFL from 2000 to mid-2005.

A Classical advent to Cryptography workout booklet for A Classical creation to Cryptography: functions for Communications safety covers a majority of the themes that make up today's cryptology, akin to symmetric or public-key cryptography, cryptographic protocols, layout, cryptanalysis, and implementation of cryptosystems. workouts don't require a wide history in arithmetic, because the most vital notions are brought and mentioned in lots of of the exercises.

The authors anticipate the readers to be pleased with simple proof of discrete chance idea, discrete arithmetic, calculus, algebra, in addition to desktop technological know-how. Following the version of A Classical advent to Cryptography: purposes for Communications safety, routines relating to the extra complicated elements of the textbook are marked with a celeb.

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Extra resources for A Classical Introduction to Cryptography Exercise Book

Sample text

We can write one round of DES as K)) (CL,CR) +- (PR,PL@ F(PR, where PL and PR denote the left and right half of the plaintext, respectively, where CL and CR denote the left and right half of the ciphertext and where K denotes the key. From the definition of the key schedule algorithm, we see that if we take the bitwise complement of the key, then each subkey will turn into its bitwise complement as well. Furthermore, from DES F-function definition, we can see that if we complement its input and the subkey, then the input of the 36 EXERCISE BOOK S-boxes and thus the output will remain the same.

Exhaustive key search on 3DES t Approx, number of wrong keys 1 2 . lo31 2 3 1012 6 . lop8 4 3. The number of wrong keys displayed by Algorithm 7 is thus ~ 3 ( 2 ~ - ~ ~ ) . 4 The number of wrong keys in this case is 0 ( 2 ~ " - ~ ~ )For . 3DES, L = 3, l = 56, and n = 64. 5 for different values of t. With 3 pairs, the adversary makes almost sure that only the good key is displayed. 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).

2. Semi-weak key pairs of DES Solution 3 Complementation Property of DES and that Z @y = x @ y. The initial and 1 First note that Z @y = final permutations (IP and IP-l) do not have any influence on our computations, so we will not consider them. We can write one round of DES as K)) (CL,CR) +- (PR,PL@ F(PR, where PL and PR denote the left and right half of the plaintext, respectively, where CL and CR denote the left and right half of the ciphertext and where K denotes the key. From the definition of the key schedule algorithm, we see that if we take the bitwise complement of the key, then each subkey will turn into its bitwise complement as well.

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


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