Patent ID: 9594897
Date: 2017-03-14
CPC Classifications: B41J,G03G,G06F

Claim:
1. An image forming apparatus, comprising: a consumable unit where a custom replaceable unit monitor (CRUM) chip is mounted; and a main body configured to perform a first authentication and a second authentication of the consumable unit, when the consumable unit is mounted, wherein the main body comprises: a main controller to perform the first authentication with respect to firmware stored in the image forming apparatus by transmitting an encoded signal including a first value to the CRUM chip, and by using a first Message Authentication Code (MAC) generated by a central processing unit (CPU) of the CRUM chip based on the first value and a second MAC generated by the main controller; and an authentication controller to use at least one ASIC (Application Specific Integrated Circuit) to perform the second authentication of the consumable unit, wherein the second authentication is performed using the at least one ASIC in parallel with performance of the first authentication, or is performed subsequent to performance of the first authentication if the first authentication succeeds.