Remanufactured Image-Forming Module Memory Authentication
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Solution Overview
Problem
Existing remanufacturing technologies for image-forming devices lack a mechanism to ensure the validity of data written to reused components, posing a risk of inappropriate operation of the image-forming apparatus.
Innovation Solution
A device with a memory structure comprising a read-only first storage area and a rewritable second storage area, along with control circuitry, ensures that only authenticated information is written to the rewritable area, using a digital signature and authentication information to verify the integrity of the data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a device is remanufactured and reused in an image-forming apparatus, then resource efficiency and environmental sustainability are improved, but the risk of inappropriate operation increases due to lack of data validity guarantee
Solution Approach 1:
The patent applies preliminary action by performing authentication and digital signature verification before writing data to the device memory during remanufacturing. The control circuitry预先 checks the authenticity of remanufacturing information and only writes verified data to the second storage area, preventing invalid data from causing inappropriate operation later.
Solution Approach 2:
The patent uses digital signatures and authentication information as intermediaries to guarantee data validity. The remanufacturing information is signed by the remanufacturer, and the image-forming apparatus verifies this signature through authentication information, creating a trusted connection between remanufacturer and user without requiring direct trust.
2Reliability
If a read-only first storage area and a rewritable second storage area are implemented, then data security and validation are improved, but device complexity increases
Solution Approach 1:
The patent segments the memory into two distinct storage areas: a read-only first storage area for storing immutable device identification information, and a rewritable second storage area for storing remanufacturing information that requires validation. This segmentation allows different security levels for different types of data.
Solution Approach 2:
The patent applies local quality by assigning different access permissions and security characteristics to different parts of the memory. The first storage area has read-only protection for critical identification data, while the second storage area allows controlled writing after authentication, matching the security requirements of each data type.
Data Source
AI summary
A device that can be attached to an image-forming apparatus includes a memory including first and second storage areas, control circuitry, and a connection interface for connecting to an information processing apparatus at a time of remanufacturing the device. The first storage area stores first information specific to the device. The second storage area stores second information read out and used by the image-forming apparatus and a digital signature generated based on the first and second information. At a time of the remanufacturing, the control circuitry receives the second information, the digital signature, and authentication information from the information processing apparatus via the connection interface, and allows the second information and the digital signature to be written to the second storage area if verification of the second information based on the authentication information is successful.