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 services. the significance of hash capabilities for shielding the authenticity of data is validated. purposes contain integrity safety, 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 keeping with common hash features is studied. an summary is given of the complexity theoretic definitions and structures. the most contribution of this thesis lies within the examine of functional buildings for hash capabilities. A basic version for hash features is proposed and a taxonomy for assaults is gifted. Then all schemes within the literature are divided into 3 periods: hash capabilities in keeping with block ciphers, hash features in line with modular mathematics and devoted hash services. an summary is given of latest assaults, new assaults are confirmed, and new schemes are proposed.The examine of uncomplicated development blocks of cryptographic hash features results in the examine of the cryptographic houses of Boolean capabilities. New standards are outlined and capabilities fulfilling new and current standards are studied.
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Additional resources for Analysis and Design of Cryptographic Hash Functions
A second possibility is to construct a key stream generator with a mode where the output of the hash function is fed back to the input, or where the input is derived from a counter. In case of a MAC the design can even be simpler, as the use of a secret key is already part of the algorithm. It is certainly possible to design more efficient encryption algorithms from scratch, but this type of solutions could be acceptable for applications where encryption is required occasionally. 6 Application to software protection To illustrate the use of a MAC, MDC, and a digital signature scheme, it will be explained how these three techniques can be applied to protect the integrity of software .
The information is divided into t b-bit blocks X1 through Xt . If the total number of bits is no multiple of the block length b, a padding procedure has to be specified. 32 CHAPTER 2. CRYPTOGRAPHIC HASH FUNCTIONS A number of examples of padding rules with increasing strength are given, where the roles of 0’s and 1’s can always be interchanged. • The simplest padding rule is to complete the information with 0’s. This padding rule is ambiguous as it not clear how many trailing 0’s are part of the information.
Damg˚ ard is also more explicit, but can be slightly misleading: in fact collisions do exist, but it should be hard to find them. An alternative that was proposed in [339, 341] is collision intractible hash functions. The term weak one-way hash function was proposed by R. Merkle in , in order to stress the difference with a strong or collision resistant hash function. Finally note that in a complexity theoretic context the term universal one-way hash function (UOWHF) was proposed by M. Naor and M.