Wireless hotspots and broadband coverage are permeating the globe giving rise to interesting spontaneous networking scenarios. The discovery and delivery of the most relevant and suitable services in a spontaneous network is a problem of paramount importance. In this paper, we propose an architecture that can support context-aware service discovery and delivery for resource-constrained mobile d...

SMS (Short Message Service) is a widely used service for brief communication. Occasionally the data sent using SMS services is confidential in nature and is desired not to be disclosed to a third party. In this paper an application for sending encrypted SMS messages using cryptographic methods based on theory of quasigroups is proposed. The encryption algorithm is characterized by a secret key....

The paper describes the concept of data security in a mobile environment. The objective is to develop Java software applications, MIDlets for mobile devices, which implement data protection at different levels. Existing and proposed solutions are described by defining security models and architectures. From the software development point of view, the paper describes two API’s, JSR 177 [1] and B...

Mobile devices have become ubiquitous, allowing the integration of new information from a large range of devices. However, the development of new applications requires a powerful framework which simplifies their construction. JXME is the JXTA implementation for mobile devices using J2ME, its main value being its simplicity when creating peer-to-peer (P2P) applications on limited devices. On tha...

We present a refinement method for Java programs which is motivated by the challenge of verifying security protocol implementations. The method can be used for stepwise refinement of abstract specifications down to the level of code running in the real application. The approach is based on a calculus for the verification of Java programs for the concrete level and Abstract State Machines for th...

The recent emergence of agent prototyping environments for developing Java agents (Aglets, JATlite, JACK, Agent Factory) and the availability of the J2ME (Java 2Micro Edition) on light devices (PDAs and cellular phones) provides the ability for strong agenthood to be delivered in the mobile and ubiquitous sector. This is an experience paper that discusses the lessons learnt in the construction ...

Performance critical multiplayer game development for the mophunTM gaming platform Games development for mobile devices is associated with several specific limitations. To study these, I designed and implemented a game slightly based on Tetris®. The hardware resources in mobile devices are always severely restricted making performance the primary goal. The new virtual machine mophun, optimised ...

With the emergence of the wireless application protocol (WAP Forum, 2000) in 1998, which provided users of mobile devices with an optimized wireless protocol to access the Internet and to browse specific Web content, and with the introduction of specialized wireless programming models such as Java 2 Mobile Edition (J2ME) (Lawton, 2002), the .Net Compact Framework (Neable, 2002), and the Binary ...

The paper presents a methodology of transmitting voice in SMS (Short Message Service) over GSM netw ork. Usually SMS contents are text based and limited to 140 bytes. It supports national and international roaming, but also supported by other telecommunication such as TDMA (Time Division Mult iple Access), CDMA (Code Division Mult iple Access) as well. It can sent/ receive simultaneously w ith ...

Building and realizing the mobile P2P VOD system based on JXME is a brand-new research work. Firstly, the main problems in the mobile P2P VOD system are analyzed. Then the related solutions on JXME are presented, and the basic architecture of the system is given. JXME platform and the key technology of P2P streaming media applying on JXME are researched and analyzed. The advantage of the techno...