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 shielding the authenticity of data is validated. functions contain integrity security, traditional message authentication and electronic signatures. Theoretical effects on cryptographic hash features are reviewed. the knowledge theoretic method of authentication is defined, and the practicality of schemes in line with common hash capabilities is studied. an outline is given of the complexity theoretic definitions and buildings. the most contribution of this thesis lies within the examine 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 periods: hash features in response to block ciphers, hash services in accordance with modular mathematics and committed hash services. an summary is given of present assaults, new assaults are validated, and new schemes are proposed.The examine of easy development blocks of cryptographic hash capabilities results in the research of the cryptographic homes of Boolean services. New standards are outlined and capabilities gratifying new and present standards are studied.
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Additional info for Analysis and Design of Cryptographic Hash Functions
Subsequently one has to protect only the integrity of the password file. In most applications it should be infeasible to derive a valid password from an entry in the file, which implies that a OWHF is sufficient. This is in fact one of the few cases were only finding a first preimage should be hard. Historically this is probably the first application of one-way functions. If a passphrase of arbitrary size has to be compressed, one will need a one-way hash function. A related application is commitment to a string without revealing it.
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 . 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.
If Cecile can find an X such that MAC(KS , X ) = MAC(KS , X), she will be able to replace X by X and convince Bob that Alice has sent to him X . Note that if the MAC intended for Bob was not encrypted under KAB , it would be trivial for Cecile to replace X by X and to update the MAC accordingly. If Cecile can select a message that has to be sent by Alice, it is even sufficient that she can produce a pair X, X such that MAC(KS , X ) = MAC(KS , X), for the given key KS . If KS is generated randomly before the MAC calculation, Cecile will not know this key, and the equality will have to hold for a reasonably large subset of the key space in order to make the attack work.
Analysis and Design of Cryptographic Hash Functions by Bart Preneel