Consumable Memory Segmentation for Secure, Flexible Image-Forming Settings
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Solution Overview
Problem
Existing image-forming devices face challenges in configuring operational settings based on recycled consumables due to the requirement of digital signatures for changing setting data, making it inconvenient to adapt the device settings to the consumable.
Innovation Solution
The image-forming device includes a consumable memory with a first area subject to a digital signature and a second area not subject to a digital signature, allowing basic information to be stored securely while switching information can be modified without a digital signature, enabling easy configuration of operational settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If setting data is stored in the memory area requiring a digital signature, then information security and tamper detection are improved, but the ease of configuring operational settings based on recycled consumables deteriorates
Solution Approach 1:
The consumable memory is divided into two distinct areas: a first area subject to digital signature for storing basic information that requires security protection, and a second area not subject to digital signature for storing switching information that needs to be easily modifiable. This segmentation allows each area to serve its specific function without compromising the other.
Solution Approach 2:
Different security attributes are applied to different parts of the memory. The first area has digital signature protection enabled for information security, while the second area has digital signature protection disabled for ease of modification. This local differentiation of security properties resolves the contradiction between security and ease of operation.
2Reliability
If digital signature is required for changing setting data, then data integrity and prevention of tampering are improved, but the adaptability of the system to recycled consumables deteriorates
Solution Approach 1:
The memory is segmented into a first area for basic information with digital signature protection and a second area for switching information without digital signature protection. This allows the system to maintain data integrity for critical information while enabling adaptability for configuration changes on recycled consumables.
Solution Approach 2:
The second area acts as an intermediary storage for switching information that mediates between the secure basic information and the need for adaptability. This intermediary area allows configuration changes without affecting the integrity of the signed basic information.
Data Source
AI summary
An image-forming device includes a device main body, a consumable, and a controller. The consumable is attachable to the device main body, and includes a consumable memory having a first area subject to a digital signature and a second area not subject to a digital signature. The controller is configured to perform a configuration process. The configuration process includes configuring, when switching information is not stored in the second area of the consumable memory, an operational setting of the image-forming device using basic information stored in the first area of the consumable memory. The switching information is for switching reference information to be used for configuring the operational setting. The basic information is information related to the operational setting. The configuration process includes configuring, when the switching information is stored in the second area of the consumable memory, the operational setting using the reference information based on the switching information.