Ivar Jørstad

Strong Authentication for Internet Applications with the GSM SIM

The mobile phone: Its evolution from a communication device to a universal companion

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The Virtual Device - The future mobile phone?

Personalisation of Next Generation Mobile Services

As communication technologies are becoming more and more advanced, the opportunities to deliver i... more As communication technologies are becoming more and more advanced, the opportunities to deliver improved, user friendly services using these technologies are increasing. One of the possible ways to improve the services is to enable personalisation. However, to enable personalisation it is not sufficient to consider the service on its own as it has been the case until now. It is necessary to consider personalisation as a higher-layer function, which should span different services, be it different service instances or different service implementations. Personalisation should also span different terminal platforms and different network technologies. It is therefore appropriate to consider personalisation as a function in the higher-layers of the service platforms, above or integrated with the existing middleware. This paper provides a precise definition of personalisation and clarifies how it will be possible to build advanced mobile services in the future which make extensive use of the personalisation function to improve the perceived value and quality of these services.

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Linux Mobile - A Platform for Advanced Future Mobile Services

Service-Oriented Architectures and Mobile Services

Service-Oriented architectures and Service-Oriented Computing are the most recent approaches aimi... more Service-Oriented architectures and Service-Oriented Computing are the most recent approaches aiming at facilitating the design and development of applications on distributed systems. The primary goal of this paper is to investigate how the construction of mobile services can benefit from the Service-Oriented paradigm. The paper provides an elucidation of the Service-Oriented architecture. A general discussion of equivalence between service components is then undertaken, in order to enable an analysis of Service-Oriented architectures for mobile services. The paper proceeds with a mapping of existing mobile services on Service-Oriented architectures. The requirements of mobile services, which must be taken into consideration in the Service-Oriented architecture, are identified from a generic model of mobile services. A Service-Oriented architecture supporting mobile services is proposed.

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Personalisation of Future Mobile Services

Personalisation has been regarded as an important feature of mobile services. Still, only few ser... more

Personalised Dynamic IMS client using Widgets

With the advent of the Web 2.0 people are allowed to communicate, exchange information and collab... more With the advent of the Web 2.0 people are allowed to communicate, exchange information and collaborate across time and space in an unprecedented way. Indeed, a range of new mediated communication forms such as blogs, social communities, picture-sharing, vlogs, wall-postings, email, etc. has emerged allowing people to communicate easily and rapidly. The few existing IMS clients are still based on the telephone metaphor which -although popular and successful -is rather limited. The EUREKA Mobicome project proposes the Personalised Dynamic IMS client, a novel IMS client architecture which makes use of the widget concept. A widget is generally speaking a small application implemented using Web 2.0 technologies. By using widget technology, the Personalised Dynamic IMS client will be able to support more natural, intuitive and richer communication paradigms as follows:

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Evolution of Mobile Services: An Analysis of Current Architectures with Prospect to Future

Lecture Notes in Computer Science, 2004

With the advent of the Internet and the plurality and variety of fancy applications it brought wi... more With the advent of the Internet and the plurality and variety of fancy applications it brought with it, the demand for more advanced services on cellular phones is increasingly becoming urgent. Unfortunately, so far the introduction of new enabling technologies did not succeed in boosting new services. The adoption of Internet services has shown to be more difficult due to the difference between the Internet and the mobile telecommunication system. The goal of this paper is to examine the characteristics of the mobile system and to clarify the constraints that are imposed on existing mobile services. The paper will also investigate successively the enabling technologies and the improvements they brought. Most importantly, the paper will identify their limitations and capture the fundamental requirements for future mobile service architectures namely openness, separation of service logic and content, multi-domain services, personalisation, Personal Area Network (PAN)-based services and collaborative services.

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Decisive Factors for Quality of Experience of OpenID authentication using EAP-SIM

When using the web, large response times are bones of contention for users, i.e. they damp the Qu... more When using the web, large response times are bones of contention for users, i.e. they damp the Quality of Experience (QoE). Though, if one knew the cause of a large response time, one can examine what can be done about this obstacle. In this paper, we determine the weak point of the Extensible Authentication Protocol Method for GSM Subscriber Identity Modules (EAP-SIM) with the OpenID service with regards to excessive authentication times, which determine the response times. In order to provoke controlled raises of latter, we emulate bad network performance by introducing bi-directional delay between the supplicant (client) and the authenticator (server). Based on a recent, exponential relationship between QoE and response time, we then identify, quantify and compare the decisive factors for QoE reduction as functions of the components of the authentication times. The results we obtain clearly show that one task of the authentication contributes significantly more to the total respo...

Evaluation of Authentication Schemes Based on Security, User-Friendliness and Complexity

In this work we are going to study and evaluate several SIMbased and non SIM-based authentication... more In this work we are going to study and evaluate several SIMbased and non SIM-based authentication schemes for use in an IMS platform. The work will be done as part of the EUREKA!-funded Mobicome project. In this project eleven partners are participating in order to get a working prototype of the new generation network IMS to run. The major idea of the extended IMS functionality is seamlessness, both regarding network and device switching. Seamlessly working security solutions are a self-evident must in this context. In order to satisfy the customer while meeting technical boundary conditions, solutions must work in a satisfactory manner in many respects. On this background, this paper is a position paper, stating started and planned work on the evaluation of candidate security solutions for seamless IMS-based communications. First, the primary criteria of evaluation, namely security, user-friendliness and simplicity, are discussed. Then, the secondary criteria, which include awarene...

Email Access via mobile Phone

WiMob'2005), IEEE International Conference on Wireless And Mobile Computing, Networking And Communications, 2005., 2005

... Do Van Thanha, Eivind Sivertsenb, Jon-finngard Moec &amp; Ivar Jørstadd a. Telenor R&... more

Performance Evaluation of JSON and XML for Data Exchange in Mobile Services

Wireless Information Networks and Systems, 2008

Securing Virtual Private Networks with SIM Authentication

Third IEEE International Conference on Wireless and Mobile Computing, Networking and Communications (WiMob 2007), 2007

ABSTRACT

Universal User Interface for IMS clients

This paper presents a solution that provides a uniform user experience over a large set of hetero... more This paper presents a solution that provides a uniform user experience over a large set of heterogeneous IMS client devices. The idea is to remove IMS client UI from the user IMS device and place it in a network server accessible everywhere in the world. The paper starts with a description of the state-of-the art IMS clients. Next, the proposed

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A service-oriented architecture framework for mobile services

Advanced Industrial Conference on Telecommunications/Service Assurance with Partial and Intermittent Resources Conference/E-Learning on Telecommunications Workshop (AICT/SAPIR/ELETE'05), 2005

Computing are the most recent approaches aiming at facilitating the design and development of app... more Computing are the most recent approaches aiming at facilitating the design and development of applications on distributed systems. The primary goal of this paper is to investi-gate how the construction of mobile services can benefit from the Service-Oriented paradigm. The paper provides a presentation of the Service-Oriented architecture. A general discussion of equivalence between service components is then undertaken, in order to enable an analysis of Service-Oriented architectures for mobile services. The paper proceeds with a mapping of existing mobile services on Service-Oriented architectures. The requirements of mobile services, which must be taken into consideration in the Service-Oriented architecture, are identified from a generic model of mobile services. A Service-Oriented architecture framework supporting mobile services is proposed.

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Service Personalisation in Mobile Heterogeneous Environments

Advanced Int'l Conference on Telecommunications and Int'l Conference on Internet and Web Applications and Services (AICT-ICIW'06), 2006

Abstract To personalize a service is to adapt its functionality and presentation according to the... more

Identity Management in Mobile Ubiquitous Environments

2008 The Third International Conference on Internet Monitoring and Protection, 2008

Identity management is one of the major challenges on the Internet today, mainly due to the ever ... more Identity management is one of the major challenges on the Internet today, mainly due to the ever increasing number of services provided and at the same time an increasing amount of fraudulent service usage. As service access is becoming more and more ubiquitous, and services are used in distributed mobile environments, the challenges are growing even more, because the different points of access can now be subject to additional types of attacks towards the user's credentials and otherwise private information. This paper considers some of the challenges in identity management on the Internet today, and adds to this the new requirements posed by identity management in mobile ubiquitous environments. The paper then studies the currently emerging identity management frameworks and standards initiatives, and sees how these cope with requirements both on the Web today as well as the new requirements posed by the introduction to the mobile ubiquitous environments. Then, architectures for identity management integration are proposed and the benefits of the architectures are discussed.

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An Open and Extensible Service Discovery for Ubiquitous Communication Systems

Lecture Notes in Computer Science, 2010

Service Naming in Future Mobile Environments

2009 International Conference on Parallel Processing Workshops, 2009

Abstract - Future mobile environments will consist of various network systems that compete to off... more

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