Deutsche Telekom

About: Deutsche Telekom is a company organization based out in Welwyn Garden City, United Kingdom. It is known for research contribution in the topics: Telecommunications network & Terminal (electronics). The organization has 3473 authors who have published 5208 publications receiving 65429 citations. The organization is also known as: DTAG & German Telecom.

Protecting data passing between data processing device and terminal device connected via telecommunications network

Abstract: The method involves using a code stored in a security module in each device for mutual authentication before commencing the transfer of data. Each code represents keys within an algorithm which processes random data fed to the terminal or data processor; the results of the processing are fed back to the data processor or terminal.The data are integrally protected when the code arrives, is stored in the terminal and transmitted using a message authentication code or MAC with the aid of algorithms and keys in each security module. Secure counters in the security modules perform additional monitoring of the data protected by the MAC.

Card terminal and method for operating a card terminal

Abstract: The invention relates to a card terminal (1) and to a method for operating a card terminal (1) for a card (7) comprising at least one card function (12, 13, 14) and a non-volatile storage (11). According to the invention, the card terminal (1) firstly determines the card function via a device (5) and, according to the card function, a data processing device (2) of the card terminal (1) is subsequently configured with regard to the software.

Network virtualization - opportunities and challenges for operators

Abstract: In the last few years, the concept of network virtualization has gained a lot of attention both from industry and research projects. This paper evaluates the potential of network virtualization from an operator's perspective, with the short-term goal of optimizing service delivery and rollout, and on a longer term as an enabler of technology integration and migration. Based on possible scenarios for implementing and using network virtualization, new business roles and models are examined. Open issues and topics for further evaluation are identified. In summary, the objective is to identify the challenges but also new opportunities for telecom operators raised by network virtualization.

Device for monitoring vital values of persons needing monitoring

Abstract: A device for monitoring vital values or functions of frail persons or persons needing monitoring is provided. The device includes units for recording and analyzing the vital values, units for determining the location of a person equipped with the device, and a mobile radio transmitter and receiver. When the monitoring function is turned on and at least one critical value is detected in the person needing monitoring, an emergency call number is automatically dialed by the device mentioned last and these data transmitted to the emergency call number. The device may be made up of at least two functional modules of which one accommodates at least the units for recording and analyzing the vital values, and one is designed as mobile telephone suitable also for voice communication. Those functional modules operate as a master-slave system.

An upper bound on the convergence time for distributed binary consensus

Abstract: The problem addressed in this paper is the analysis of a distributed consensus algorithm for arbitrary networks, proposed by Benezit et al. In the initial setting, each node in the network has one of two possible states (“yes” or “no”). Nodes can update their states by communicating with their neighbors via a 2-bit message in an asynchronous clock setting. Eventually, all nodes reach consensus on the majority states. We use the theory of electric networks, random walks, and couplings of Markov chains to derive an O(N4 log N) upper bound for the expected convergence time on an arbitrary graph of size N.