Location Based Services can be considered as the most rapidly expanding field of the mobile communications sector. The proliferation of the mobile/wireless Internet, the constantly increasing use of handheld, mobile devices and positioning technologies ...

Positioning is an essential component for the deployment of the evolving context-aware concepts. Information Society Technologies (IST) project PoLoS investigates existing schemes for Location-Based Services, Geographical Information Systems, ...

Attribute Certificates (ACs) have been developed and standardized by the ANSI X9 committee as an alternative and better approach, to X.509 public key certificates, for carrying authorization information. Attribute Authorities (AA) bind the ...

Next Generation Wireless Systems (NGWS) will provide a variety of services to mobile users including high speed data, real-time applications and real-time multimedia support with a certain quality of service (QoS) level. An efficient handoff management ...

In this paper we investigated the issues pertaining to streaming generalized XML documents over the wireless environment. We highlight the disadvantages of employing existing approach to fragment and manage the transfer of XML contents across a wireless ...

Web cache replacement algorithms have received a lot of attention during the past years. Though none of the proposed algorithms deals efficiently with all the particularities of the Web environment, namely, relatively weak temporal locality (due to ...

Being E-commerce one of the most critical Internet application, it is fundamental to employ technologies which guarantee not only secure transactions but also an adequate quality of service. In this paper we present a solution to this problem based on ...

E-commerce is based on transactions between client and server agents. These transactions require a protocol that provides privacy and reliability between these two agents. A widely used protocol on e-commerce is Transport Layer Security (TLS). In this ...

Next generation mobile devices will allow users to share and pass information within anonymous groups of people in an ad hoc manner. This will smooth the path for many kinds of new mobile commerce applications. In this paper we present a mobile commerce ...

Web Services standards and protocols (WSDL, UDDI, SOAP, etc.) are the basis of a novel technology supporting Web based applications. Web Services are components offering ports at which service invocations can be sent using XML-based protocols. The tools ...

The development of (internet) agents is often a tedious and error-prone task resulting in poorly reusable designs, since both the internal computation of the agent as well as the coordination support are developed in an ad hoc fashion. To improve the ...

In our present work we introduce the use of data fusion in the field of DoS anomaly detection. We present Dempster-Shafer's Theory of Evidence (D-S) as the mathematical foundation for the development of a novel DoS detection engine. Based on a data ...

With the continuous evolution of the types of attacks against computer networks, traditional intrusion detection systems, based on pattern matching and static signatures, are increasingly limited by their need of an up-to-date and comprehensive ...

Enterprise privacy policies often reflect different legal regulations, promises made to customers, as well as more restrictive enterprise-internal practices. The notion of policy refinement is fundamental for privacy policies, as it allows one to check ...

We investigate the fair bandwidth sharing among responsive and unresponsive traffic flows. When these flows compete for the same output link in a router, unresponsive flows tend to occupy more than their fair share of the link capacity. We propose a new ...

This paper presents a new system level simulator that has been developed to evaluate E-UMTS (Enhanced Universal Mobile Telecommunication Systems) 3G Networks. The article describes how the simulator supports different mobility, propagation, and traffic ...

Internet Protocol-based applications are the prevailing trend of the telecommunications market, but the path towards the "IP over everything" target is not unhampered. The main shortcoming of the IP protocol is its incapability of providing guaranteed ...

New protocols and network applications must be extensively tested before deployment on the Internet. In this paper, we describe the design and implementation of EmuNET, a lightweight, portable, configurable, and extendable network emulator, which can be ...

In this paper, we first present the concept of self-configuration and self-provisioning applied into the scope of the IP routers. A global view of the concepts which are addressed in this document is given, considering the automation level of the ...