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US 9,003,520 B2Granted
Securing a storage element for a binary datum, control register and chip card
AssigneeOberthur Technologies
InventorsNicolas Morin, Thiebeauld De La Croue Hugues
Life of this patent
Estimating the term…
Abstract
Securing a storage element for a binary datum, control register and chip card. This element (60) for storing a binary datum (D) inputs a signal representative of said binary datum, said storage to be carried out when an enable signal (ENA) is at a first predetermined level, supplies an output signal (Q) the state whereof represents the datum stored in said storage element (10), and detects an attack aimed at said enable signal (ENA) or at a signal internal to said storage element.
Claims11
A device of storage element configured to store a single binary datum, the storage element comprising:
- a flip-flop formed by a plurality of logic gates, the flip-flop being configured to store the single binary datum;
- means for inputting an enable signal to the flip-flop;
- means for generating a secure enable signal;
- means for inputting a signal representative of said binary datum to the flip-flop, said storage to be performed by the flip-flop when the enable signal is at a first predetermined level;
- means for supplying an output signal from the storage element, the state of the output signal representing whereof represents the datum stored in said flip-flop;
- means for detecting commutation of the output signal;
- and
- means for detecting an attack directly against said enable signal or an intermediate signal internal to said storage element so as to prevent the storage of a datum in the storage element upon detecting attack.
5 more elements
Dependencies are inferred from the claim text.