Thomas Bahls

DuDE: A distributed computing system using a decentralized P2P environment

The P2P-based system for the distributed computing of statistics called DuDE is presented. High scalability and failure resilience features of P2P are exploited to achieve a high-performance distributed system, which avoids the bottlenecks of a centralized computing system. To ensure high data availability, a sophisticated algorithm for distributed data storage is integrated. Furthermore, an algorithm for global peer discovery is presented, which allows for finding all data assigned to peers without the need for a central instance. For the realization of DuDE, common working stages of distributed computing are extended to enable a highly scalable computing system based on P2P technology. Generated results from a test system show a nearly perfect linear speedup for distributed computing as well as high processor and memory relief compared to a centralized solution.

Trust-by-Wire in packet-switched networks: Calling line identification presentation for IP

During the last decades, the Internet has steadily developed into a mass medium with millions of users. On the one hand, newfangled services replace traditional ones. Naturally, these are thereby expected to offer at least the same features as their classical pendants, e.g., when VoIP replaces traditional fixed line telephone networks. On the other hand, the requirements on network infrastructures and services have changed. A reason for that is the lack of Trust-by-Wire in packet-switched IP networks. In traditional telephone networks, a phone number directly coheres with a physical line. This direct relationship is not given in modern packet-switched IP networks. An IP address does not identify a physical line! This paper presents a new mechanism, which guarantees Trust-by-Wire in packet- switched IP networks -called Internet Protocol-Calling Line Identification Presentation (IPclip). Unambiguous and trustworthy location information is added on the IP level. Firstly, IPclips general functionality is presented. Secondly, we discuss IPclip in the light of location-aware emergency calls in nomadic VoIP environments.

Countering phishing threats with trust-by-wire in packet-switched ip networks - a conceptual framework

During the last years, the Internet has grown into a mass-medium for communication and information exchange. Millions of people are using the Internet for business and in social life. Users can be reached easily and cost-effectively. Unfortunately the Internets open structure is the reason for its frequent misuse for illegal and criminal actions such as dissembling phishing attacks. Thus, anti-phishing techniques are needed to recognize potential phishing threats. But mostly these techniques are only of reactive nature, are soon circumvented by expert frauds, or are not efficient enough. This paper describes an anti-phishing framework. A concept for trust management and a mechanism called IPclip are presented. The main idea of IPclip is to guarantee trust-by-wire in packet-switched networks by providing trustworthy location information along with every IP packet. This information is used as supplementary and trustworthy trigger to identify potential phishing threats. Besides, the proposed framework allows for tracing the threats origin by using a set of location information.

IPclip: An architecture to restore Trust-by-Wire in packet-switched networks

During the last decades, the Internet has steadily developed into a mass medium. The target group radically changed compared to, e.g., the 90s. Because virtually everyone has access to the Internet, threats due to insecurity and anonymity reach critical levels and have to be tackled by both carriers and Internet Service Providers. Regaining trust-by-wire, comparable to classic fixed line telephones, could mitigate or even solve problems like Spam, Phishing, and the localization of VoIP emergency calls. This paper presents the hardware implementation of a new and highly flexible solution-Internet protocol-calling line identification presentation-which provides additional support for new services to restore peoplepsilas confidence into the Internet. Supported services are VoIP emergency calls, Spam detection and prevention, and phishing prevention. Already in the access network, the hardware adds unambiguous location information on the packetpsilas origin to IP packets. We document the hardware design of the solution. Furthermore, hardware consumption and performance of a prototype are presented.

Trust-by-Wire in Packet-Switched IPv6 Networks: Tools and FPGA Prototype for the IPclip System

This demonstration shows the hardware prototype of the IPclip (IP Calling Line Identification Presentation) mechanism for IPv6 networks. IPclip is a mechanism, which provides Trust-by-Wire in IP-based networks by adding trustworthy location information to IP packets. It is implemented on an FPGA development board and configurable at runtime via a graphical configuration tool. We show IPclips basic functionality in a localization scenario using an analysis tool and Google Earth and discuss several application scenarios during the demonstration.