Cartridge Chip Authentication via Central Server
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Solution Overview
Problem
Existing technologies fail to effectively prevent the use of unauthorized cartridges and refills in printers and copy machines, leading to financial losses for manufacturers due to the ability of unauthorized chips to be reset or replaced.
Innovation Solution
Implementing a system with a cartridge chip containing an encryption key and a computation engine that communicates with a central server for authorization, using a nonce and pre-defined calculations to verify the authenticity of the cartridge and authorize refills, ensuring only authorized refills are performed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a chip is installed on the cartridge to record ink or toner amount, then the cartridge usage can be tracked, but the chip can be reset or replaced by unauthorized refill kits, compromising security
Solution Approach 1:
The patent introduces a central server as an intermediary between the printing device and the cartridge. The server hosts a database of authorized cartridge identifiers and communicates with the printing device to verify cartridge authenticity. This mediator approach prevents unauthorized chips from being accepted, as the printing device must validate cartridge identifiers against the centralized database rather than relying solely on local chip verification.
Solution Approach 2:
The system implements feedback by continuously monitoring cartridge usage and communicating with the central server to verify authorization status. The printing device receives feedback from the server regarding whether a cartridge is authorized for use or refill. This feedback mechanism ensures that even if a chip is physically present, unauthorized cartridges cannot be used or refilled without server confirmation.
2Loss of energy
If manufacturers rely on cartridge sales for revenue, then profit margins are maintained, but unauthorized cartridges and refills cause financial losses
Solution Approach 1:
The patent implements preliminary action by requiring cartridge authorization to be verified before the cartridge can be used or refilled. The printing device must communicate with the central server to confirm the cartridge identifier is authorized prior to any operation. This preliminary verification prevents unauthorized cartridges from being used or refilled, protecting manufacturer revenue while allowing legitimate cartridges full functionality.
3Reliability
If a centralized authorization system is implemented, then unauthorized refills are prevented, but system complexity and communication requirements increase
Solution Approach 1:
The patent extracts the complex authorization logic and database storage functions from the printing device and concentrates them in a central server. The printing device itself remains relatively simple, requiring only the capability to communicate with the server and verify received authorization responses. This extraction approach centralizes the complexity in a dedicated system while keeping individual printing devices simple.
Data Source
AI summary
A chip for a cartridge with dispensable material may be provided. In one aspect, the chip may comprise a non-volatile memory for storing a number tracking amount of dispensable material in the cartridge, a key storage for storing an encryption key, a signature verification module and circuit components. The circuit components may be configured to receive and process a first message, receive and validate a second message, and update the amount of dispensable material if the validation of the second message succeeds. The first message may comprise a first command and an operation input value for a print job at the cartridge, and to process the first message may comprise decreasing the amount of dispensable material. The second message may comprise a second command to increase the amount of dispensable material, and may be validated using the signature validation module and the encryption key.