Patent ID: 7585043
Filing Date: 2009-09-08
Classification: G03G,G06F,G06Q,H04L

Abstract:
1. A method of authenticating a consumable having a memory and used in an imaging device, comprising: performing a first renewal of said consumable; generating a first authentication code configured both for authentication and for signifying said first renewal; and storing said first authentication code in said memory of said consumable; performing a second renewal of said consumable; generating a second authentication code configured both for authenticating and for signifying said second renewal; and storing said second authentication code in said memory of said consumable; wherein said first authentication code is generated using a first algorithm and said second authentication code is generated using a second algorithm, the first and the second algorithm uses a secret key that depends upon type of ink being used in the imaging device; and wherein said second algorithm uses said first authentication code in generating said second authentication code.