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US 8,782,767 B2Granted
Upgradable security module
AssigneeNagravision S.A.
InventorMichael John Hill
Life of this patent
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Abstract
The aim of the present invention is to provide a security module capable of supporting the different functions of the latest and the previous generations, by avoiding any possible attack due to this adaptability. This aim is attained by a security module comprising first communication means to a host device, first storage means and first decryption means, characterized in that it includes a state module and second communication means and physical activation or deactivation means of said second means, such activation or deactivation being managed by the state module.
Claims12
A security module comprising:
- a first communication port connectable to a host device;
- a first storage device;
- a first decryption means;
- a hardware or software state module, which is configured to detect activity on a communication port and to determine, according to the activity, a state of said state module;
- a second communication port;
- and
- an insulating circuit placed in series with the second communications port and configured to electronically isolate said second communication port, said insulating circuit being controlled by the state module;
- wherein the insulating circuit includes tri-state or bidirectional MOSFET elements;
- and
- where at least a portion of a physical connection path including the first communication port is different from at least a portion of a connection path including the second communication port;
- wherein the security module is configured to receive a security message via the first or second communication port, and modify a state of said state module defining an accessibility of the security module to the host device via the second communication port in response to the security message.
8 more elements
Dependencies are inferred from the claim text.