Tampering Detection in Multifunction Printer Programs
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Solution Overview
Problem
Existing multifunction machines with secure boot functionality do not effectively detect tampering in both the main body and printing unit programs, leading to potential safety and operational issues during startup.
Innovation Solution
An image processing apparatus with separate tampering detection units for the main body and printing unit programs, along with a notification system that provides distinct alerts for each, ensuring proper intervention techniques are communicated to the user for both program types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single tampering detection unit is used for both main body and printing unit programs, then the device complexity is reduced, but the measurement precision of tampering detection is insufficient
Solution Approach 1:
The patent divides the tampering detection function into separate detection units: a first tampering detection unit for detecting tampering in main body programs and a second tampering detection unit for detecting tampering in printing unit programs. This segmentation allows each unit to independently verify its respective program, improving detection precision while maintaining manageable system complexity through modular architecture.
2Ease of operation
If uniform notification is provided for all tampering cases, then the ease of operation is improved, but the loss of information occurs
Solution Approach 1:
The patent implements differentiated notification mechanisms tailored to specific tampering scenarios. When tampering is detected in main body programs, a first notification is provided; when tampering is detected in printing unit programs, a second notification is provided. This local quality approach ensures that users receive precise information about the location and nature of tampering, enabling appropriate intervention while maintaining clear and actionable communication.
Data Source
AI summary
An image processing apparatus includes a first printing unit; a printing controller that performs control of the first printing unit; a controller that performs at least control other than control of the first printing unit; a first tampering detector that performs detection of tampering of a first program to be stored in a first non-volatile memory and to be executed by the controller; a second tampering detector that performs detection of tampering of a second program to be stored in a second non-volatile memory and to be executed by the printing controller; and a notification unit that performs a first notification and a second notification with a notification content that differs between the first notification corresponding to a first detection result obtained by the first tampering detector and the second notification corresponding to a second detection result obtained by the second tampering detector.