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

ISBN-10: 038728835X

ISBN-13: 9780387288352

This significant other workout and answer publication to A Classical advent to Cryptography: purposes for Communications Security features a rigorously revised model of educating fabric. It was once 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 creation to Cryptography workout booklet for A Classical advent to Cryptography: functions for Communications safety covers a majority of the themes that make up today's cryptology, reminiscent of symmetric or public-key cryptography, cryptographic protocols, layout, cryptanalysis, and implementation of cryptosystems. routines don't require a wide heritage in arithmetic, because the most crucial notions are brought and mentioned in lots of of the exercises.

The authors anticipate the readers to be happy with uncomplicated evidence of discrete chance thought, discrete arithmetic, calculus, algebra, in addition to computing device technology. Following the version of A Classical advent to Cryptography: functions for Communications safeguard, routines on the topic of the extra complex components of the textbook are marked with a celeb.

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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 blocks of the corresponding ciphertexts are denoted C1, C2, and C3. 5, find a relation between A", k3, IV, and C1. Similarly, find a relation between A", IV, C1, and C2. Deduce a relation between k3, IV, C1, and C2. 3 Deduce an attack which recovers k3. Once k3 is found, how do you recover kl and k2?

Do you think that it is more secure than DES? 7 Let x and x' be two plaintexts, and let y = ExtDESK,llK2(x) and y' = ExtDESK,11K, (2') be the corresponding known ciphertexts. Explain how a smart choice of x and x' allows us to detect that we have u4 = uh and vq = vh simultaneously (here uh and vi are the internal intermediate values for computing y'). 8 Use the previous question to mount a chosen plaintext attack whose goal is to find a (x, x') pair with u4 = u&and v4 = vi simultaneously. What is the complexity of this attack?

In other words, in the case of minority control, if we try to recover the initial state of the LFSRs by guessing the clocking sequence, then after guessing two bits for the first clocking, we only need to guess 314 bit every clock afterwards on average. In the case of majority control, the knowledge of the previous clocking tells us nothing about the next one. We conclude that the majority control (the actual one used in A5/1) is a better choice from the security point of view. , without making any assumption about the distribution of K.

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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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