Abstract: Data is transmitted by a first terminal (11) to a second terminal (12) in a telecommunications network (10) in a plurality of sets of data packets. In the first and second terminals, as a function of a selection rule common to the first and second terminals, transmission frequencies are selected from transmission frequencies in a secret list of transmission frequencies that is common to the first and second terminals. Next, the sets of data packets are transmitted (15, 16) from the first terminal to the second terminal at respective selected transmission frequencies. The common list of transmission frequencies is allocated on the basis of available frequencies with respect to the first and second terminals and collected from the telecommunications network.

Abstract: Data is transmitted by a first terminal (11) to a second terminal (12) in a telecommunications network (10) in a plurality of sets of data packets. In the first and second terminals, as a function of a selection rule common to the first and second terminals, transmission frequencies are selected from transmission frequencies in a secret list of transmission frequencies that is common to the first and second terminals. Next, the sets of data packets are transmitted (15, 16) from the first terminal to the second terminal at respective selected transmission frequencies. The common list of transmission frequencies is allocated on the basis of available frequencies with respect to the first and second terminals and collected from the telecommunications network.

Abstract: An access control system and method, a component-based kernel including it, and its use. A compromise is achieved between security and reconfigurability while providing high security by combining, in a system for controlling access by subjects S to objects, whether secured or not, for operations mij, access control decision means (10) and an access protection mechanism (PA) that enables access to be authorized or denied depending on the validity of access capacities. The access control decision means (10) allocate capacities for access to non-secured objects and modify the validity of capabilities for access to secured objects based on access rights, said decision means (10) being implemented by the access protection mechanism (PA) if the access capabilities are invalid.