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By Bart Preneel

Книга research and layout of Cryptographic Hash features research and layout of Cryptographic Hash capabilities Книги Криптография Автор: Bart Preneel Год издания: 2003 Формат: pdf Страниц: 338 Размер: 1.4 Язык: Английский eighty five (голосов: 1) Оценка:The topic of this thesis is the examine of cryptographic hash services. the significance of hash capabilities for safeguarding the authenticity of knowledge is tested. functions contain integrity security, traditional message authentication and electronic signatures. Theoretical effects on cryptographic hash features are reviewed. the data theoretic method of authentication is defined, and the practicality of schemes in keeping with common hash features is studied. an summary is given of the complexity theoretic definitions and buildings. the most contribution of this thesis lies within the examine of functional structures for hash services. A common version for hash services is proposed and a taxonomy for assaults is gifted. Then all schemes within the literature are divided into 3 periods: hash services in response to block ciphers, hash features in accordance with modular mathematics and committed hash features. an outline is given of current assaults, new assaults are established, and new schemes are proposed.The research of easy development blocks of cryptographic hash services results in the examine of the cryptographic houses of Boolean features. New standards are outlined and capabilities pleasing new and current standards are studied.

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Extra info for Analysis and Design of Cryptographic Hash Functions

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Finally note that in a complexity theoretic context the term universal one-way hash function (UOWHF) was proposed by M. Naor and M. Yung in [233]. The main characteristic of this one-way hash function is that it is randomly selected from a large set and independently of the data to be hashed. This implies trivially that producing collisions for a single hash function is useless. To avoid confusion between this very specific definition and the more general one-way hash function, this term will only be used in the complexity theoretic approach.

2. The argument X has a fixed length of m bits and the result g(X) has a fixed length of n bits (with n ≥ 128 cf. 1). 3. Given g and X, the computation of g(X) must be “easy”. 4. The function must be one-way in the sense that given a Y in the image of g, it is “hard” to find a message X such that g(X) = Y and given X and g(X) it is “hard” to find a message X = X such that g(X ) = g(X). 5. The function must be collision resistant: this means that it is “hard” to find two distinct messages that yield the same result.

Xi . t. Xi , or given Hi−1 , Hi , (and Xi ) it must be “hard” to find an Xi = Xi such that f (Xi , Hi−1 ) = Hi . The expression “for a given . . ” implies that Hi−1 and Hi can not be selected directly by an attacker. This attack can be used to construct either a preimage or a second preimage. If a direct attack requiring 2s operations can be mounted such that only n < n bits of Hi are matched, finding a (second) preimage will require 2n−n +s operations, which is more efficient than exhaustive search if s < n .

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Analysis and Design of Cryptographic Hash Functions by Bart Preneel

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