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 research of cryptographic hash capabilities. the significance of hash features for safeguarding the authenticity of data is established. functions comprise integrity safeguard, 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 response to 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 learn of useful structures 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 services in keeping with block ciphers, hash services in accordance with modular mathematics and committed hash features. an summary is given of latest assaults, new assaults are proven, and new schemes are proposed.The research of simple construction blocks of cryptographic hash services ends up in the learn of the cryptographic houses of Boolean capabilities. New standards are outlined and services enjoyable new and latest standards are studied.
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Extra resources for Analysis and Design of Cryptographic Hash Functions
If no r bits are left in the incomplete last block, one or more blocks have to be added. • Padding of the information with z 0’s except for the last r bits; these contain the length of the information in bits. If no r bits are left in the incomplete last block, one or more blocks have to be added. If this padding rule is applied, no message can be obtained from another message by deleting the first blocks. The choice between these different rules depends on the application, but it will become clear that the last one offers a larger security level, and is therefore strongly recommended.
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.
Moreover, one should specify an upper bound on the size of the input. In case of a MAC, it is a common mistake to choose the IV equal to the secret key. If this is the only way the key is involved in the MAC calculation, one can append an arbitrary number of blocks to the message and update the hashcode without knowledge of the secret key. 4. GENERAL CONSTRUCTIONS 35 and at the end of the computations, but it is recommended that f depends on the secret key. Research on hash functions has been focussed on the question: what conditions should be imposed on f to guarantee that h satisfies certain conditions ?
Analysis and Design of Cryptographic Hash Functions by Bart Preneel