Consumable Digital Signature Verification for Printer Authenticity
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Solution Overview
Problem
Non-authorized third parties attempt to reverse engineer and connect to authorized print apparatus components, posing a challenge in ensuring the authenticity and integrity of replaceable consumables like ink or toner cartridges.
Innovation Solution
Implementing a digital signature scheme using a private key to authenticate consumables, where the host's firmware verifies the digital signature using a corresponding public key, ensuring only genuine consumables are accepted, and rejecting non-genuine ones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital signature verification is implemented to ensure consumable authenticity, then security and reliability are improved, but device complexity increases due to additional verification mechanisms
Solution Approach 1:
The digital signature is generated and embedded in the consumable during manufacturing before the consumable is used. This preliminary action ensures that authenticity verification data is already in place, eliminating the need for complex real-time authentication mechanisms during operation.
Solution Approach 2:
The patent uses digital signature technology where a cryptographic copy (signature) of the consumable's identity data is created and stored. The host system verifies authenticity by checking this digital copy against the original data, simplifying the verification process compared to physical security features.
2Reliability
If digital signature data is stored in the consumable, then authenticity verification capability is improved, but memory usage increases
Solution Approach 1:
The patent extracts only the essential verification data (digital signature and associated metadata) from the complete consumable identity information. By storing only the critical authentication elements rather than all consumable data, memory usage is minimized while maintaining verification capability.
Solution Approach 2:
The digital signature uses cryptographic algorithms to transform consumable identity data into a compact verification format. This parameter transformation reduces the amount of data that needs to be stored while preserving the ability to verify authenticity through cryptographic validation.
3Object-affected harmful factors
If digital signature verification is implemented, then protection against unauthorized copies is improved, but ease of operation decreases due to additional verification steps
Solution Approach 1:
The consumable performs self-verification by presenting its digital signature to the host system automatically upon installation. This self-service approach eliminates the need for manual authentication steps by the user, maintaining ease of operation while ensuring security.
Solution Approach 2:
The digital signature verification is automatically performed by the host system as part of the consumable installation process without requiring user intervention. This preliminary automated action blocks unauthorized copies before they can be used, while keeping the user experience simple and uninterrupted.
Data Source
AI summary
A logic circuitry package includes an interface to communicate with a controller and a logic circuit. The logic circuit includes a memory arrangement storing indicated data over which a manufacturing digital signature is computed, a certificate for the controller to verify the manufacturing digital signature, and manufacturing attribute data. The manufacturing attribute data includes at least one indication indicating the indicated data and the manufacturing digital signature. The logic circuit is configured to transmit, to the controller, the manufacturing attribute data in response to at least one first request from the controller. The logic circuit is configured to transmit, to the controller, the certificate and the indicated data in response to at least one second request from the controller.