Abstract: Some embodiments of the teachings herein include a method for integrating a new component with a device certificate of a domain with a domain root certificate into a network with at least one existing component with an existing device certificate of the domain. An example method includes: accepting a request from the new component signed with the device certificate of the domain; determining the existing component with the existing device certificate transmitting the request to the existing component; verifying the device certificate using the domain root certificate of the domain; providing a response signed with the existing device certificate and provided with a network certificate using the existing component or obtaining a response signed with the existing device certificate and provided with a network certificate from the existing component; transmitting the response to the new component; and integrating the new component into the network using the network certificate.

Abstract: The invention relates to a method for generating and/or validating electronic signatures during which an asymmetric key pair is generated that comprises a private signature key and a public validation key. In addition, at least one electronic signature is calculated by using the private signature key and by applying a predeterminable signature function for at least one electronic document. A certification of the public validation key ensues after the calculation of the at least one electronic signature.

Abstract: A method for access control to computer-controlled programs, which can be used at the same time by a plurality of users. A user sends a request regarding a program to a unit for organizing a data flow. It is checked in this unit whether the user which sent the request, has originally started the program. When the user sending the request has started the program, the request is forwarded to the program. If not, an access control with respect to the request is carried out on the basis of an access control data bank. When it derives from the access control that the request is an allowed request, the request is forwarded to the program. When it derives from the access control that the request represents an unallowed request, the request is not forwarded to the program.

Abstract: A premixing chamber of a nebulizing device for an exhaust gas purification system serves to mix a compressed gas such as compressed air, for example, with a reducing agent such as urea solution, for example. The premixing chamber is set up on the carburetor principle and includes a compressed gas feed having a taper and a reducing agent feed opening in the region of the taper. The premixing chamber ensures that no deposits originating from the reducing agent can settle in the region of the mixing route. The premixing chamber is provided, in particular, for an exhaust gas purification system of a vehicle fitted with a regulated diesel catalytic converter as well as for stationary diesel engines of up to about 1000 kW (mechanical power).