Abstract: An x-ray system comprising: at least two system statuses; at least one system status value associated with at least one of the at least two system statuses; at least one trigger; at least one activation parameter associated with the at least one trigger; the at least one activation parameter is selected from the group consisting of: (a) at least one system status value; (b) at least one system status value with a tolerance; and (c) at least one range of system status values; at least one set associated with the at least one trigger, the at least one set comprises at least one system status parameter, the at least one system status parameter comprises at least one of: (1) a system status value; (2) a system status value with a tolerance; and (3) a range of system status values; and wherein the system status is changed according to the set upon activation of the at least one trigger.

Abstract: A method in which a telephony operator acts as a recording authority and certification authority for secured transactions between a subscriber and a provider. Communications between the subscriber (101) and the operator (113) are signed with a symmetrical algorithm (108c, 117C). The communications between the operator and the provider are countersigned according to PKI technologies (117E, 124A), and an asymmetrical algorithm. Two configurations are possible: either the operator signs the contents of each of the subscriber/provider transactions with his own dual key, after validation, or the operator implements a secure and repudiable signature transfer, in his network, to a remote terminal (using a secret key technology This reduces the resources needed for a subscriber's terminal. It also gives the operator greater visibility of the operations occurring in his network and ensures the validity of the transactions.