By Bart Preneel
Книга research and layout of Cryptographic Hash capabilities 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 learn of cryptographic hash services. the significance of hash features for safeguarding the authenticity of knowledge is tested. functions contain integrity defense, traditional message authentication and electronic signatures. Theoretical effects on cryptographic hash capabilities are reviewed. the data theoretic method of authentication is defined, and the practicality of schemes in accordance 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 sensible buildings for hash capabilities. A normal 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 line with block ciphers, hash features in accordance with modular mathematics and devoted hash services. an summary is given of present assaults, new assaults are tested, and new schemes are proposed.The examine of easy development blocks of cryptographic hash features results in the research of the cryptographic homes of Boolean features. New standards are outlined and capabilities fulfilling new and current standards are studied.
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Extra resources for Analysis and Design of Cryptographic Hash Functions
He can however not repeat this type of fraud, as he will loose quickly the trust of his customers. Every vendor has to store one secret key, while every user needs an authentic storage for the public key of every vendor. The selection of a particular solution will depend on the one hand on the number of users, vendors and programs, and on the other hand on the availability of authentic and/or secret storage and communication. The digital signature is clearly the only solution that can protect the users against a malicious software vendor.
CRYPTOGRAPHIC HASH FUNCTIONS of r n-bit quantities, under the restriction 1 ≤ r ≤ min(t, 2n/2 ) . Proof: One calculates and stores the first r intermediate values Hi of the computation of h(X). After computing 2n /r values for H1 = h(IV, X1 ) with randomly chosen X1 , the probability for a match between H1 and some Hi , say for i = i∗ is approximately 63% (cf. appendix B). Then the message X = (X1 , Xi∗ +1 , . . , Xt ) hashes to the same value as the message X (note that the probability that X = X is negligible).
This redundancy consists of constant bits, a repetition of bits, or even a more complex procedure. The price paid for this redundancy is a decreased speed of the hash function. The specification of a hash function requires the description of f , IV , a padding procedure, and optionally a preprocessing stage. If a hash function h is collision resistant, this implies that it should be hard to find an input pair X, X such that h(X) = h(X ), for a given IV , padding procedure and preprocessing stage.