By Bart Preneel
Книга research and layout of Cryptographic Hash capabilities research and layout of Cryptographic Hash features 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 shielding the authenticity of knowledge is established. functions comprise 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 according to 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 learn of sensible buildings for hash services. 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 sessions: hash services in line with block ciphers, hash capabilities in accordance with modular mathematics and committed hash features. an summary is given of present assaults, new assaults are established, and new schemes are proposed.The learn of uncomplicated development blocks of cryptographic hash services ends up in the learn of the cryptographic homes of Boolean capabilities. New standards are outlined and services pleasing new and present standards are studied.
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4. In , it was shown that if the padding contains the length of X, and if the message (without padding) contains at least 2 blocks, ideal security of f against a backward attack is necessary and sufficient for ideal security of h with fixed IV (cf. 2). 4 Assume that the padding contains the length of the input string, and that the message X (without padding) contains at least 2 blocks. Then finding a second preimage for h with a fixed IV requires 2n operations if and only if finding a second preimage for f with arbitrarily chosen Hi−1 requires 2n operations.
Subsequently she sends the complete message to Bob and Cecile. Both can easily verify the authenticity of X, and Cecile can not cheat because she does not know KAB . The disadvantage of this scheme is that Alice has to compute twice a MAC. • To reduce the computational load, a scheme was proposed where the MAC is computed only once with a single session key KS : MAC(KS , X). This key is sent together with the message under encrypted form such that KS can be retrieved by both Bob and Cecile.
To protect against an attack of an outsider, if suffices that the MDC is a OWHF. He is not able to select the messages that he will attack, and hence he has to come up with a new message with the same hashcode as one of these messages. It is of no help for him to have a set of collisions that are randomly distributed over the message space. For an insider the situation is completely different: if he is able to find two messages say X and X with the same hashcode, he can sign X and at a later stage claim that he has signed X .
Analysis and Design of Cryptographic Hash Functions by Bart Preneel