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US 2006/0143449 A1Published application
Security-translator
AssigneeAlcatel
InventorsMartin Groger, Markus Fohrenck, Christian Scholz
Life of this patent
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AssigneeAlcatel
InventorsMartin Groger, Markus Fohrenck, Christian Scholz
Estimating the term…
A security translator (STL) that serves for connecting a data network (N2) pertaining to a lower security level to a data network (N1) pertaining to a higher security level examines its own integrity at definite intervals in order to ascertain malfunctions and, where appropriate, to trigger a transition to the secure failure state. The secure failure state consists in the connection from the data network with a lower security level to the data network with a higher security level being interrupted. This is obtained by means of a watchdog circuit (WD1, WD2) which keeps the connection (CTN) between the data network (N2) with a lower security level and the data network (N1) with a higher security level closed as long as it receives regular signs of life and which automatically interrupts the connection if it receives no sign of life over a predetermined period.
An apparatus for connecting a data network pertaining to a lower security level to a data network pertaining to a higher security level, including
A process for checking the integrity of an apparatus that serves for connecting a data network pertaining to a lower security level to a data network pertaining to a higher security level and that contains a telegram filter for the purpose of filtering telegrams out of the data network with a lower security level in accordance with predetermined filter rules and contains a watchdog circuit which is designed to keep the connection between the data network with a lower security level and the data network with a higher security level closed as long as it receives regular signs of life and which is designed to interrupt the connection automatically if it receives no sign of life over a predetermined period, the following steps being executed in the course of the process:
Dependencies are inferred from the claim text.