The question if there exist nonnormal bent functions was an open question for several years.
A Boolean function in n variables is called normal if there exists an affine subspace of …

Bent functions are those Boolean functions whose Hamming distance to the Reed–Muller
code of order 1 equal 2n-1-2n/2-1 (where the number n of variables is even). These …

The security of hash functions has recently become one of the hottest topics in the design
and analysis of cryptographic primitives. Since almost all the hash functions used today …

The Session Initiation Protocol (SIP) protocol is commonly used to establish Voice over IP
(VoIP) calls. IETF SIP standards do not specify a secure authentication process thus …

In this paper, we explore the 256 elementary cellular automata rules by a Walsh transform in
order to find out correlation-immune rules for generating good pseudo-random sequences …

Recently multi-block collision attacks (MBCA) were found on the Merkle-Damgård (MD)-
structure based hash functions MD5, SHA-0 and SHA-1. In this paper, we introduce a new …

We study the problem of secure key establishment. We critically examine the security
models of Bellare and Rogaway (1993) and Canetti and Krawczyk (2001) in the …

In this article we present a detailed analysis of the impact of carries on the estimation of the
attack complexity for SHA-1. We build up on existing estimates and refine them. We show …

The design of secure compression functions is of vital importance to hash function
development. In this paper we consider the problem of combining smaller trusted …

Özet Bu tez, simetrik kriptografinin en önemli iki yapısı olan blok ve akış şifreleri ile ilgilidir.
Blok ve akış şifrelerinin en önemli yapıları Boolean fonksiyonları ve vektöryel Boolean …