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

ISBN-10: 038728835X

ISBN-13: 9780387288352

This significant other workout and answer ebook to A Classical creation to Cryptography: functions for Communications Security features a rigorously revised model of training fabric. It used to be utilized by the authors or given as examinations to undergraduate and graduate-level scholars of the Cryptography and defense Lecture at EPFL from 2000 to mid-2005.

A Classical advent to Cryptography workout e-book for A Classical creation to Cryptography: functions for Communications safeguard covers a majority of the topics that make up today's cryptology, resembling 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 count on the readers to be ok with uncomplicated proof of discrete chance idea, discrete arithmetic, calculus, algebra, in addition to laptop technology. Following the version of A Classical advent to Cryptography: functions for Communications protection, workouts regarding the extra complex components of the textbook are marked with a celebrity.

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**Extra info for A Classical Introduction to Cryptography Exercise Book**

**Sample text**

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. We denote by D the corresponding decryption function, such that Dk(Ek(P)) = P for any plaintext P E (0, l)n and any key k E (0, Instead of using a simple cascade of block ciphers, we consider so called multiple modes of operation. 3). Just as cascade of block ciphers consists in concatenating block ciphers, multiple modes of operation consist in concatenating modes of operations.

The list of all possible keys is denoted {kl, k2,. . , 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).

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?

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

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