In order to sketch, why steganography is such an important topic, and has received far too little attention from the hacker community in the past, let me quickly challenge our view of cryptosystems as commonly built in the context of military or commercial applications: Cryptosystems are designed to protect our sensitive data from evil arbitrators. Wrong. Well, maybe not. But then again, what i...

In two previous essays (Perron, 2006 and Arsenault & Perron 2008), I have conceptualized the partaking in a game as a cognitive frame, as an ongoing process. To explain the gamer's immersion and progression through a game, I have resorted to the figure of the cycle, of the spiral instead of talking about Huizinga's " magic circle ". In this model, three interconnected spirals are represented: t...

BACKGROUND Ethiopia has high prevalences of udder health problems including clinical and subclinical mastitis across production systems in different livestock species. Previous studies on udder health problems have largely focused on identification of mastitis causing microbial pathogens and associated risk factors. However, relatively little is known about the knowledge and beliefs of livestoc...