Imaging Device Operational History Tamper Detection
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Solution Overview
Problem
Existing systems fail to securely verify printer information and diagnose imaging device failures due to tampering or alteration of usage history, particularly with counterfeit cartridges, which affects warranty claims and accurate troubleshooting.
Innovation Solution
Implementing a tamper-evident system that encrypts data related to print cartridges and imaging device operations, using a trusted subsystem to gather and encrypt operational history, and storing it in non-volatile memory with a one-time programmable memory to record instances of data gathering, ensuring integrity and authenticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If printer operational information is stored in plain text or easily accessible format, then ease of operation for troubleshooting is improved, but security against tampering and alteration is worsened
Solution Approach 1:
The system segments operational information into multiple encrypted log files stored in non-volatile memory, with each file containing specific operational data. This segmentation allows secure storage while maintaining organized access for troubleshooting purposes.
Solution Approach 2:
The patent introduces an intermediary verification process that uses cryptographic authentication to mediate between the stored operational data and the troubleshooting access. This intermediary layer ensures data integrity while allowing authorized access for diagnostics.
2Difficulty of detecting and measuring
If operational history is made accessible for troubleshooting, then diagnostic capability is improved, but vulnerability to user tampering and information suppression is worsened
Solution Approach 1:
The system applies preliminary anti-action by pre-encrypting operational logs and implementing authentication mechanisms before any access occurs. This preventive approach counteracts potential tampering before it can happen, while still allowing legitimate diagnostic access through proper verification.
Solution Approach 2:
The patent employs disposable one-time programmable (OTP) memory elements that can be used once to verify authenticity and then become unusable. This disposable approach provides strong security against tampering while enabling single-use diagnostic verification.
3Reliability
If encryption is implemented on operational data, then security and tamper detection are improved, but complexity of the system is worsened
Solution Approach 1:
The patent extracts the cryptographic verification functionality into a separate, dedicated authentication module that operates independently from the main printer control system. This extraction reduces the complexity burden on the primary system while maintaining strong security through specialized hardware or firmware.
4Measurement precision
If complete operational history is retained for warranty verification, then warranty validation accuracy is improved, but risk of information alteration and deletion is worsened
Solution Approach 1:
The system performs preliminary actions by encrypting and authenticating operational logs at the time they are created and stored in non-volatile memory. This preliminary security measure ensures that the complete operational history remains intact and unalterable throughout its retention period, enabling accurate warranty verification.
Data Source
AI summary
The invention is directed to a method for performing failure analysis on an imaging device that includes retrieving an encrypted error log containing one or more error conditions that occurred on the imaging device, decrypting the retrieved encrypted error log, determining if the retrieved encrypted error log has been altered based on the decrypted error log, and upon determining that the retrieved encrypted error log has not been altered, performing failure analysis on the imaging device using the decrypted error log.