The development of Software for mobile and embedded devices is usually strongly connected with the corresponding operating system. Due to the fact that operating systems like Windows Mobile or Symbian OS are linked with a licence model, Linux-based systems are more practicable today, even though the development is connected with more implementation-effort.
The Universal subscriber identity module (USIM)-card poses an interesting environment for applications, which need a cheap platform with mature security functionality and easy-application development. A benefit of SIM-based applets is the fact, that the application is portable to other devices and there is little installation effort.

In the course of this thesis an implementation of a basic Smartcard Webserver (SCWS) was realized on a Java Card USIM. The prototype is able to transfer content from the USIM to the browser of a mobile phone using Hypertext Transfer Protocol (HTTP). Furthermore remote access to the USIM and the file-system is implemented.
The focus of this thesis is the description of the requirements, the concept development and the realization of a Smartcard Webserver prototype.

Inaugurating the technical aspects, which represent the basis for the implementation are presented. A detailed consideration of the architecture, the file-system and the cryptografic functionality of USIM-cards are shown.
Furthermore programming-interfaces and network-protocols are discussed. The related research-activities are presented and should highlight the increasing potential and market of SIM-card applications.

The paper ends up with a use-case demonstration of the implementation and a discussion about the future potential of SIM-card applications.