Abstract: A first cryptographic key (318) and a second cryptographic key (322) are created by a mobile radio terminal (103) and by a computer of the home communications network (108, 109) by using authentication key materials (312). The first cryptographic key (318) is transmitted to the computer of the visited communications network (113), and the second cryptographic key (322) is transmitted to an application server computer (106, 107).

Abstract: Cryptographic material is generated for a protocol for the encrypted transmission of media data between a subscriber device and a provider device. A first symmetric key of the subscriber device and the provider device is inserted in a symmetric key protection mechanism of a network protocol of a control layer to establish a communication session between the subscriber device and the provider device. A first time-variable parameter is transmitted from the provider device to the subscriber device. A second symmetric key for protecting the key management protocol is calculated by both the provider device and the subscriber device using a defined function depending at least on the first symmetric key and the first time-variable parameter.

Abstract: The invention relates to a method for authenticating a radio communication network vis-à-vis a mobile station. In such a method, batches of authentication vectors that each contain an authentication token with a pertaining sequence number are generated on the network side. At the mobile station side an identity module of the mobile station decides whether a sequence number contained in a previously selected authentication vector is accepted for authentication or rejected. The identity module is informed by the radio communication network which authentication tokens with the pertaining sequence numbers are present in the same batch. One sequence number per batch is stored by the identity module and is used to decide whether the sequence number received is accepted or rejected.

Abstract: The invention concerns countering a rogue shell threat in a cellular mobile communication system by an apparatus or a method for authentication in a mobile communication system comprising a mobile communication network (VLR/SGSN/HLR/RNC . . .

Abstract: To safeguard data transmission, a first terminal communicates in a first network with the aid of at least one session key and a second terminal communicates in a second network with the aid of at least one session key. The first terminal is connected to the second terminal through a local interface. In the first terminal, at least one first session key is determined and at least one second session key is derived from the first session keys. At least one second session key is transmitted to the second terminal through the local interface by a safety protocol. The second terminal is authenticated to the second network by at least one second session key or by the key derived from the second session key(s) through an authentication protocol.

Abstract: In the method and the arrangement for checking the authenticity of a first communication subscriber in a communications network, a first fault information item is formed in the first communication subscriber using a fault detection data item of the first communication subscriber and an information item relating to a random data item. In a second communication subscriber in the communications network, a second fault information item is formed using a fault detection data item of the second communication subscriber and the information relating to the random data item. The authenticity of the first communication subscriber is checked using the first fault information and the second fault information.

Abstract: Method and arrangement for checking the authenticity of a first communication subscriber in a communications network In the method and the arrangement for checking the authenticity of a first communication subscriber in a communications network, a first fault information item is formed in the first communication subscriber using a fault detection data item of the first communication subscriber and an information item relating to a random data item. In a second communication subscriber in the communications network, a second fault information item is formed using a fault detection data item of the second communication subscriber and the information relating to the random data item. The authenticity of the first communication subscriber is checked using the first fault information and the second fault information.

Abstract: The invention relates to a method which can be used to declare a session key (K) between a first computer unit (U) and a second computer unit (N) without it being possible for an unauthorized third party to obtain useful information regarding the keys or the identity of the first computer unit (U). This is achieved by embedding the principle of El-Gamal key interchange in the method with additional formation of a digital signature using a hash value whose input variable contains at least variables which can be used to infer the session key unambiguously.

Abstract: In the method and the arrangement for checking the authenticity of a first communication subscriber in a communications network, a first information item is formed in the first communication subscriber using a fault detection data item of the first communication subscriber and an information item relating to a random data item. In a second communication subscriber in the communications network, a second fault information item is formed using a fault detection data item of the second communication subscriber and the information relating to the random data item. The authenticity of the first communication subscriber is checked using the first fault information and the second fault information.

Abstract: In the method and the arrangement for checking the authenticity of a first communication subscriber in a communications network, a first information item is formed in the first communication subscriber using a fault detection data item of the first communication subscriber and an information item relating to a random data item. In a second communication subscriber in the communications network, a second fault information item is formed using a fault detection data item of the second communication subscriber and the information relating to the random data item. The authenticity of the first communication subscriber is checked using the first fault information and the second fault information.

Abstract: The method provides that a session code (K) can be agreed between a first computer unit (U) and a second computer unit (N), without it being possible for any unauthorized third party to gain access to useful information relating to the codes or the identity of the first computer unit (U). This is achieved by embedding the principle of the El-Gamal code interchange in the method, with additional formation of a digital signature via a hash value of the session code (K) which is formed by the first computer unit (U).

Abstract: The invention has developed an improved coil form permitting automated fabrication of a strain-relieved connection between external leads fed in an insulated fashion through an opening of a surrounding motor stator housing and the winding ends of the exciter winding wound on the coil form; for that purpose the design has a plastic bracket hinge-mounted and molded on an end flange of the coil form, which upon making the connection can be pivoted over the exciter winding and can then mate with the other end flange.

Abstract: In the method and the arrangement for checking the authenticity of a first communication subscriber in a communications network, a first fault information item is formed in the first communication subscriber using a fault detection data item of the first communication subscriber and an information item relating to a random data item. In a second communication subscriber in the communications network, a second fault information item is formed using a fault detection data item of the second communication subscriber and the information relating to the random data item. The authenticity of the first communication subscriber is checked using the first fault information and the second fault information.