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

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

ISBN-10: 0387279342

ISBN-13: 9780387279343

ISBN-10: 038728835X

ISBN-13: 9780387288352

This spouse workout and answer ebook to A Classical creation to Cryptography: functions for Communications defense includes a conscientiously revised model of training fabric utilized by the authors and given as examinations to advanced-level scholars of the Cryptography and safety Lecture at EPFL from 2000 to mid-2005. A Classical creation to Cryptography workout Book covers a majority of the topics that make up brand new cryptology, together with symmetric or public-key cryptography, cryptographic protocols, layout, cryptanalysis, and implementation of cryptosystems. workouts don't require an intensive history in arithmetic, because the most crucial notions are brought and mentioned in lots of of the routines. The authors anticipate the readers to be ok with uncomplicated evidence of discrete likelihood thought, discrete arithmetic, calculus, algebra, and laptop technological know-how. Following the version of A Classical creation to Cryptography: functions for Communications safeguard, workouts on the topic of the extra complex components of the textbook are marked with a celeb.

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

ISBN-10: 0387279342

ISBN-13: 9780387279343

ISBN-10: 038728835X

ISBN-13: 9780387288352

This spouse workout and answer ebook to A Classical creation to Cryptography: functions for Communications defense includes a conscientiously revised model of training fabric utilized by the authors and given as examinations to advanced-level scholars of the Cryptography and safety Lecture at EPFL from 2000 to mid-2005. A Classical creation to Cryptography workout Book covers a majority of the topics that make up brand new cryptology, together with symmetric or public-key cryptography, cryptographic protocols, layout, cryptanalysis, and implementation of cryptosystems. workouts don't require an intensive history in arithmetic, because the most crucial notions are brought and mentioned in lots of of the routines. The authors anticipate the readers to be ok with uncomplicated evidence of discrete likelihood thought, discrete arithmetic, calculus, algebra, and laptop technological know-how. Following the version of A Classical creation to Cryptography: functions for Communications safeguard, workouts on the topic of the extra complex components of the textbook are marked with a celeb.

Show description

Read Online or Download A Classical Introduction to Cryptography Exercise Book PDF

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Additional info for A Classical Introduction to Cryptography Exercise Book

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Using your approximation, how should t be selected in order to be almost sure to have only one good key candidate after an exhaustive search on 3DES (with 3 independent keys)? D Exercise 11 Solution on page 44 Attacks on Encryption Modes I 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, l)n is the ciphertext obtained by encrypting P under the key k.

3). Just as cascade of block ciphers consists in concatenating block ciphers, multiple modes of operation consist in concatenating modes of operations. 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.

A For R1 = 0: In this case, if R2[10] = R3[10] = 1 and R2[21] = R3[22] we know that we obtain the all-zero keystream. There are 222+23-3= 242 different initial states that satisfy these constraints. a For R2 = 0: Similarly, we find 219+23-3 = 239 different initial states that produce the all-zero keystream. a For R3 = 0: Similarly, we find 219+22-3 = 238 different initial states that produce the all-zero keystream. Summing up these values, we obtain a lower bound between 262 and 263 on the number of possible initial states that produce the all-zero keystream.

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


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