Download e-book for iPad: Algorithmic Cryptanalysis (Chapman & Hall Crc Cryptography by Antoine Joux

By Antoine Joux

ISBN-10: 1420070029

ISBN-13: 9781420070026

Illustrating the facility of algorithms, Algorithmic Cryptanalysis describes algorithmic equipment with cryptographically appropriate examples. concentrating on either deepest- and public-key cryptographic algorithms, it offers every one set of rules both as a textual description, in pseudo-code, or in a C code application. Divided into 3 components, the ebook starts off with a brief creation to cryptography and a historical past bankruptcy on undemanding quantity conception and algebra. It then strikes directly to algorithms, with each one bankruptcy during this part devoted to a unmarried subject and infrequently illustrated with easy cryptographic functions. the ultimate half addresses extra refined cryptographic functions, together with LFSR-based move ciphers and index calculus tools. Accounting for the impression of present machine architectures, this booklet explores the algorithmic and implementation points of cryptanalysis equipment. it could actually function a instruction manual of algorithmic tools for cryptographers in addition to a textbook for undergraduate and graduate classes on cryptanalysis and cryptography.

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In the middle phase, the FTG adversary produces a pair of messages (M0 , M1 ). The wrapper simply forwards this pair and the environment’s answer. At the end, the wrapper copies the output of the FTG adversary. Clearly, the wrapper in the LOR context is as successful as the original adversary in the FTG context. Moreover, the number and length of queries and the running times are essentially identical. 3 Real or random distinguishers The FTG and LOR distinguishers both test the ability of an adversary to extract information from ciphertexts when a very small amount of information remains unknown.

2, it is easy, given two integers A and B to obtain three integers α, β and e such that: αA − βB = 2e GCD(A, B). 7) Elementary number theory and algebra background 31 In order to obtain B´ezout’s coefficients, it suffices to modify the above coefficients in order to get rid of the unwanted factor 2e . After possibly exchanging the role of A and B, we may assume that α ≥ 0 and β ≥ 0. Without loss of generality, we may also assume that A and B are not both even. Indeed, the B´ezout’s coefficients of 2A and 2B are the same as the B´ezout’s coefficients of A and B.

Instead, we use a self-randomizing property of modular square roots, choose a random value r and ask for a square root s of r2 (mod N ), while keeping r secret. After this operation, r/s is a random square root of 1. Thus, it is non-trivial with probability 1/2 (or more, if N has more factors) and leaks the factorization of N . Another application is to show that the knowledge of φ(N ) is also enough to factor N . Indeed, writing φ(N ) = 2e I, we may see that for any number x in Z/N Z, letting y = xI and squaring y repeatedly, we obtain 1.

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Algorithmic Cryptanalysis (Chapman & Hall Crc Cryptography and Network Security) by Antoine Joux

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