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.

Acquisition of malicious code using active learning

Abstract: A method for efficiently detecting unknown malicious code, according to which a Data Set that is a collection of files that includes a first subset with malicious code and a second subset with benign code files is created and malicious and benign files are identified by an antivirus program. All files are parsed using n-gram moving windows of several lengths. The TF representation is computed for each n-gram in each file and an initial set of top features of all n-grams is selected, based on the DF measure. The number of the top features is reduced to comply with the computation resources required for classifier training, by using features selection methods. The optimal number of features is determined, based on the evaluation of the detection accuracy of several sets of reduced top features and a dataset with a distribution of benign files is greater than the distribution of and malicious files is prepared, where a portion of the dataset is used for training the classifier. New malicious codes within a stream of new files are automatically detected and acquired by using Active Learning.

Method for continuously verifying user identity via keystroke dynamics

Abstract: A method of verifying the identity of users according to their interaction with a keyboard device of a computer, according to which during a training phase in which a group of users are trained, input streams of keystrokes performed by each of the trained users are recorded and similar pairs of consecutive keystrokes are joined, based on their temporal features. A features vector is then extracted from each input stream of keystrokes, so as to create a user verification model representing the user typing patterns. During a verification phase in which real-time streams of keystrokes are verified, input streams of keystrokes performed by a verified user are recorded and each of the streams is transformed to a features vector. A vector of probabilities indicating the probabilities that the features vector belongs to each user is generated and the stream of keystrokes and associating it with the user with the highest probability is classified.

Microstructured Polymer Optical Fibers Compared to Conventional POF: Novel Properties and Applications

Abstract: While polymers are not the traditional materials for optical fibers, polymer optical fibers (POF) have a number of advantages over their glass counterparts for fiber sensors, particularly when coupled range of properties that can be produced using microstructures. This paper reviews some of the recent progress in microstructured polymer fiber sensors and compares them to conventional POF. Sensors considered include mechanical strain sensors and aqueous biosensors based on surface enhanced Raman spectroscopy (SERS) and surface plasmon resonance (SPR).

Method of allotting and withdrawing reception authorisation for chargeable reception

Abstract: The method could use a three-branch tree with two branching levels, such that the keys for the branches K (2,i) are stored in a decoder Di or a chip card, i having the values from 1 to 9. The root possesses the system key SK = K (O,1), while the keys for the other nodes are given. The keys stored in the decoder serve for decoding the received cryptograms or control words. Each cryptogram can allow a decoder to receive programmes, for example along the branch from K(2,1), through K(1,1) to SK = (0,1), when the decoder is D1 and the key is K(2,1).

System for monitoring wearers of protective respiratory equipment

Abstract: The invention relates to a system for monitoring wearers of protective respiratory equipment and to a mobile unit and a base station for using in a system of this type. The aim of the invention is to reduce the risks to wearers of protective respiratory equipment. To this end, system data are continually transmitted to a base station (20) by a mobile unit (21) which is fitted to a compressed air breathing apparatus (22) and which has a radio transmitter (60). The wearer of the protective respiratory equipment and a person monitoring them receive acoustic and/or visual alarm signals and warning signals according to the system data.