Cryptanalysis of Hiji-bij-bij (HBB)

A Near-Practical Attack Against B Mode of HBB

Stream cipher Hiji-Bij-Bij (HBB) was proposed by Sarkar at Indocrypt’03. This cipher uses cellular automata (CA). The algorithm has two modes: a basic mode (B) and a self-synchronizing mode (SS). This article presents the first attack on B mode of HBB using 128 bit secret key. This is a known-pliantext guess-then-determine attack. The main step in the attack guesses 512 bits of unknown out of t...

Hiji-bij-bij : A New Stream Cipher with Self-Syn hronizing and MAC Modes of Operation

On the Efficiency of P2P Service Trading through Social Networks

We consider a set U of users connected in a social network GS = (U,F ), where the social link set F ⊂ U × U defines the friends relations between users. If user i treats j as his friend, i connects to j through a directed link 〈i, j〉 ∈ F . Suppose each user can provide some services, and also want to consume some services provided by other users. We can define a demand graph GD = (U,D), where D...

Parametric Stabilization Is Easy*

A polynomially parametrized family of continuous-time controllable linear systems is always stabilizable by polynomially parametrized feedback. 1. RESULTS Theorem 1. Let (Aλ,Bλ) be a pair of matrices, all whose entries are real polynomial functions of the parameter λ∈Rr. Assume that Aλ is n×n , Bλ is n×m, and that the pair (Aλ,Bλ) is controllable for each λ∈Rr. Then, there exists an m×n matrix ...

Insect bite hypersensitivity in Belgian warmblood horses: prevalence and risk factors Zomereczeem bij Belgische warmbloedpaarden: prevalentie en risicofactoren

Zomereczeem is een allergische reactie op specifieke antigenen in het speeksel van Culicoides-muggen of andere insecten. In deze studie werden omgevingsfactoren geïdentificeerd die geassocieerd zijn met het voorkomen van zomereczeem bij Belgische warmbloedpaarden (BWP) in Vlaanderen (België). Daarvoor werden met behulp van een enquête 3409 gegevens over zomereczeem verzameld tijdens sportwedstr...