Embedding data and information related to function with which data is associated into a payload

• US 7,770,008 B2
• Filed: 12/02/2003
• Issued: 08/03/2010
• Est. Priority Date: 12/02/2002
• Status: Expired due to Fees

• Current Assignee: Memjet Technology Ltd. (Memjet Limited)
• Original Assignee: Silverbrook Research Pty Limited
• Inventors: Walmsley, Simon Robert
• Primary Examiner(s): LOUIE, OSCAR A
• Assistant Examiner(s): LOUIE, OSCAR A
• Application Number:
  US10/727,274
• Publication Number:
  US 20050166040A1
• Time in Patent Office: 2,436 Days
• Field of Search: 713/150, 713/156, 713/168, 713/169, 713/155, 713/176, 380/255
• US Class Current: 713/170
• CPC Class Codes: B41J 2/04505 aiming at correcting alignment
• CPC Class Codes: B41J 2/04508 aiming at correcting other parameters
• CPC Class Codes: B41J 2/0451 for detecting failure, e.g. clogging, malfunctioning actuator
• CPC Class Codes: B41J 2/04528 aiming at warming up the head
• CPC Class Codes: B41J 2/04541 Specific driving circuit
• CPC Class Codes: B41J 2/04543 Block driving
• CPC Class Codes: B41J 2/04563 detecting head temperature; Ink temperature
• CPC Class Codes: B41J 2/04573 Timing; Delays
• CPC Class Codes: B41J 2/04586 controlling heads of a type not covered by groups B41J2/04575 - B41J2/04585, or of an undefined type
• CPC Class Codes: B41J 2202/20 Modules
• CPC Class Codes: G06F 21/554 involving event detection and direct action
• CPC Class Codes: G06F 21/57 Certifying or maintaining trusted computer platforms, e.g. secure boots or power-downs, version controls, system software checks, secure updates or assessing vulnerabilities
• CPC Class Codes: G06F 21/575 Secure boot
• CPC Class Codes: G06F 21/64 Protecting data integrity, e.g. using checksums, certificates or signatures
• CPC Class Codes: G06F 21/71 to assure secure computing or processing of information
• CPC Class Codes: G06F 21/73 by creating or determining hardware identification, e.g. serial numbers
• CPC Class Codes: G06F 21/74 operating in dual or compartmented mode, i.e. at least one secure mode
• CPC Class Codes: G06F 21/78 to assure secure storage of data address-based protection against unauthorised use of memory G06F12/14; record carriers for use with machines and with at least a part designed to carry digital markings G06K19/00
• CPC Class Codes: H03K 5/1252 Suppression or limitation of noise or interference specially adapted for transmission systems H04B15/00, H04L25/08
• CPC Class Codes: H04N 1/405 Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
• CPC Class Codes: Y10S 707/99933 : Query processing, i.e. searching
• CPC Class Codes: Y10S 707/99939 : Privileged access
• CPC Class Codes: Y10T 29/49401 : Fluid pattern dispersing device making, e.g., ink jet

Abstract

A method of generating and sending a message from a first entity is provided in which a message including an action is determined, an authentication code is generated on the basis of the determined action and a parameter, and the message and authentication code are sent from the first entity. The parameter is indicative of an attribute of the action.

Claims

1. A method of generating and sending a message from a first entity to a second entity, the first entity being an authentication integrated circuit of a printer consumable and the second entity being an authentication integrated circuit of a printer, the method including the steps of:

determining the message including an action with respect to consumable state data stored by the first entity;

generating an authentication code on the basis of the action and a parameter by applying a one-way function to the action and parameter, the parameter being indicative of an attribute of the action; and

sending the message and authentication code from the first entity to the second entity.

3. A method according to claim 1 or 2, wherein the action is a function, and the parameter is indicative of the function.

4. A method according to claim 3, wherein the entity is capable of generating messages for each of a plurality of types of function, and the parameter is indicative of the type of function comprised by the message that is sent.

5. A method according to claim 3, wherein the message includes one or more operands of the function.

6. A method according to claim 5, wherein the function is a read function and the one or more operands include an address to be read.

7. A method according to claim 5, wherein the function is a write function and the one or more operands include data to be written.

8. A method according to claim 4, wherein the types of function include at least a read and a write, wherein the authentication step produces a different authentication code depending upon whether the action is a read or a write.

9. A method according to claim 4, wherein the authentication step produces includes authentication codes.

2. A method of generating and sending a message from a first entity to a second entity, the first entity being an authentication integrated circuit of a printer consumable and including an identifier that distinguishes it from a plurality of other entities of other printer consumables, the second entity being an authentication integrated circuit of a printer, the method comprising the steps of:

determining the message including an action with respect to consumable state data stored by the first entity;

generating an authentication code on the basis of the action and a parameter by applying a one-way function to the action and parameter, the parameter being based on the identifier; and

sending the message and authentication code from the first entity to the second entity.