US 2010/0134541 A1Published application

Secure updating of integrated circuits

AssigneeSilverbrook Research Pty Ltd

InventorSimon Robert Walmsley

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Abstract

A method of attempting a write to an entity to cause performance of an action is provided in which a first message is sent to the entity which causes performance of the action and adjustment of initial values in respective security fields of the entity to respective first adjusted values, and a second message is sent to the entity which causes adjustment of the initial values to respective second adjusted values. The security fields have write restrictions which prevent values in the security fields being adjusted, in accordance with the first message, if the initial values have been adjusted in accordance with the second message, and vice versa. The action is only performed when the initial values have been adjusted in accordance with the first message. The respective first adjusted values are different than the respective second adjusted values.

Claims8

Dependent claims

A method of attempting a write to a first integrated circuit to cause performance of an action, the method comprising the steps of:

sending a first message to the first integrated circuit, the first message being configured to cause the first integrated circuit to perform the action and to adjust initial values in respective security fields of the first integrated circuit to respective first adjusted values;
and
sending a second message to the first integrated circuit, the second message being configured to cause the first integrated circuit to adjust the initial values in the respective security fields to respective second adjusted values;
wherein the security fields have associated write restrictions which prevent values in the security fields being adjusted:
in accordance with the first message, if the initial values have been adjusted in accordance with the second message;
and
in accordance with the second message, if the initial values have been adjusted in accordance with the first message,
the action is only performed when the initial values in the security fields have been adjusted in accordance with the first message, and
the respective first adjusted values are different than the respective second adjusted values.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/697,272Filed 31 Jan 2010
Priority: AU 20029531342 Dec 2002
Published: 3 Jun 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification29 codes

G06F 21/73
To assure secure computing or processing of information: by creating or determining hardware identification, e.g. serial numbers
B41J 2/04505
Control methods or devices therefor, e.g. driver circuits, control circuits: aiming at correcting alignment
B41J 2/04508
Control methods or devices therefor, e.g. driver circuits, control circuits: aiming at correcting other parameters
B41J 2/0451
Control methods or devices therefor, e.g. driver circuits, control circuits: for detecting failure, e.g. clogging, malfunctioning actuator

Family

Application10/727,164Continuation · filed 2 Dec 2003
Application12/697,272Continuation
US 2004/0221287 A1Published application
US 7,707,621 B2Related patent
US 7,996,880 B2Related patent
US 2010/0134541 A1This patent

From the US filing history. Foreign family members aren’t listed.