Abstract: A method (400, 500, 600, 700) for synchronizing state information in a security gateway cluster comprising at least two nodes comprises the following steps. Synchronizing (403) state information by sending state information from a first node of said at least two nodes, detecting (401) in said security gateway cluster a predetermined irregularly occurring action, and initiating (402) synchronization of state information as a response to said action. The state information is sent to at least a second node of said at least two nodes. Corresponding computer program, computer program product, software entities (910, 920), a node (900) of a security gateway cluster (950) and a security gateway cluster are also presented.

Abstract: A method for processing data packets in a gateway element comprises the steps of: comparing a data packet to screening information comprising a set of rules, and processing a data packet according to a rule belonging to the set of rules, the header information of said data packet matching the header information of said rule. The method is characterized in that said screening information is hierarchically structured so that it comprises a first rule, which specifies first header information, and a subset of rules relating to said first rule, and in that in said step of comparing a data packet, said data packet is compared to said subset of rules only if the header information of the data packet matches the header information of the first rule. A gateway element, an arrangement, and a data structure comprising screening information are also presented.

Abstract: An incinerator room to store secret documents and destroy them automatically according to a burn sequence by spraying slow burning flammable liquid on the contents of said room from one or more reservoirs. A control circuit, preferably supplied with energy from a secure source such as a battery, controls the ignition sequence to spray the flammable liquid, then start ignition means and start an exhaust fan and open optional electrically operated shutters or flue. The electrically operated flue prevents unauthorized access to the room by humans or fiber optic spying apparatus via ingress through the chimney of the exhaust system. Pressurized reservoirs and electrically operated valves are used in the preferred embodiment.