Blind people need to become as independent as possible in their daily life in order to guarantee a fully social inclusion. Mobility means the possibility of freely moving, without support of any accompanying person, at home, in public and private buildings, and in open spaces, as the streets of the town. Mobile and wireless technologies, and in particular the ones used to locate persons or objects, can be used to realize navigation systems in an intelligent environment. Such systems open new opportunities to improve the speed, easiness, and safety of the visually impaired persons mobility. Using these technologies together with Text To Speech systems and a mobile-based database the authors developed a cost effective, easy-to-use orientation and navigation system: RadioVirgilio/SesamoNet 1. The cost effectiveness is due to the recovery of RFID identity tags from cattle slaughtering: these tags are then borrowed to create a grid used for navigation. In this paper the results of an usability analysis of this guide system are presented. A preliminary experiment involving a small group of experts and a blind person is described. In order to evaluate the usability, three cognitive walkthrough sessions have been done to discuss the system's basic functionality and to highlight the most critical aspects to be modified. © 2007 IEEE

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The aim of this paper is to propose a solution for a potential vulnerability in mobile proximity payment. The mobile proximity payment is the evolution of the card payment whose reference standard is EMV (Europay, MasterCard and VISA). A mobile proximity payment transaction is performed via radio waves so there is the possibility to intercept the communication with the point-of-sale and also to activate the payer device, in a range of 10 cm. The EMV protocol assumes that within a range of 10 cm card fraud is hard to perform, moreover IC card capable point of sale are considered safe a priori, while the card must authenticate itself. This allows a leak of card information. In this paper we describe a possible solution to this problem, adding a safe level to the EMV protocol in the case of mobile proximity payment transactions. Our solution is a Needham-Schroeder based protocol, that guarantees authentication and confidentiality between the entities involved in the payment

We present a mobile game to play a museum treasure hunt, addressed to students that are about 11-14. They have to search for the " materializations" of the solutions to a sequence of riddles, and to photograph them by personal camera phones. The letters of a secret word are orderly provided on right answers, spurring the interest for the exhibition through the cellular phone. The novelty is the use of QR-Codes, a kind of 2D codes, to identify the correct answers and to enjoy some other services. A preliminary field test in the Norsk Telemuseum gave very good results. Copyright 2009 ACM