By Bart Preneel

Книга research and layout of Cryptographic Hash services research and layout of Cryptographic Hash services 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 features. the significance of hash capabilities for shielding the authenticity of data is verified. purposes 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 line with common hash services is studied. an summary is given of the complexity theoretic definitions and buildings. the most contribution of this thesis lies within the research of useful structures for hash services. A basic version for hash capabilities 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 capabilities in keeping with modular mathematics and committed hash services. an summary is given of latest assaults, new assaults are tested, and new schemes are proposed.The learn of easy construction blocks of cryptographic hash capabilities results in the research of the cryptographic houses of Boolean capabilities. New standards are outlined and services pleasant new and present standards are studied.

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Note that if short messages are to be signed, the only argument to use a hash function is the destruction of the algebraic structure of the message space. An alternative to a hash function is the addition of well chosen redundancy to the information. An elegant proposal to avoid multiplicative attacks against the RSA digital signature scheme can be found in [137, 155]. Other solutions and their analysis can be found in [79, 80]. 2 Practical digital signatures based on a one-way function One-way functions are closely related to one-way hash functions; the only difference is that the input now has to be of fixed length.

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.

If a dispute occurs, one has to show to a judge that the value of an MDC is authentic: it is generally not possible to prove to the judge who actually modified the authentic channel and the program. The main advantage is that this approach requires no secret storage. Every program needs an authentic storage both at the user’s site and at the vendor’s site. 4. GENERAL CONSTRUCTIONS 31 Digital signature: the software vendor will append to the program a digital signature that is computed with his secret key.

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