Print Component Logic Circuitry for Secure Sensor Authentication
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Solution Overview
Problem
Current print apparatus systems face challenges in efficiently communicating and authenticating replaceable print components, particularly in ensuring the quality and functionality of these components, which affects the overall printing process and reliability.
Innovation Solution
The implementation of a logic circuitry package with dual addresses (I2C and a temporary second address) allows for secure communication and authentication, enabling the print apparatus to verify the identity, status, and functionality of replaceable components through a validation process that includes sensor data validation and cryptographic authentication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single I2C address is used for communication with replaceable print components, then the communication protocol is simple, but security and authentication capabilities are insufficient
Solution Approach 1:
The addressing system is segmented into two distinct addresses: a first I2C address for standard communication and a second temporary address for authenticated communication. This segmentation allows the system to maintain simple addressing for routine operations while providing enhanced security mechanisms when needed, resolving the contradiction between simplicity and security.
Solution Approach 2:
The logic circuitry dynamically switches between the first I2C address and the second temporary address based on authentication status and communication requirements. The second address is temporarily activated after successful authentication, providing security only when necessary, thus maintaining overall system simplicity while enhancing reliability.
2Reliability
If multiple validation requests are processed sequentially, then authentication security is enhanced, but communication time increases
Solution Approach 1:
Authentication is performed as a preliminary action before activating the second temporary address. By validating the replaceable print component beforehand and establishing cryptographic credentials in advance, the system ensures authentication security without requiring multiple sequential validation requests during normal communication, thus reducing time loss.
3Measurement precision
If sensor data is validated through cryptographic authentication, then data integrity is improved, but processing complexity increases
Solution Approach 1:
A cryptographic intermediary mechanism is introduced where the logic circuitry acts as a mediator between the sensor data and the host system. The logic circuitry validates sensor data using cryptographic methods and presents authenticated results to the host, ensuring data integrity while shielding the host from the complexity of cryptographic validation processes.
4Reliability
If a temporary second address is activated for authenticated communication, then security is enhanced, but device operation complexity increases
Solution Approach 1:
The logic circuitry automatically manages the activation and deactivation of the second temporary address based on authentication status. Once a replaceable print component is authenticated, the logic circuitry self-service activates the second address for secure communication without requiring manual intervention, maintaining ease of operation while enhancing security.
Data Source
AI summary
In an example, a method includes, by logic circuitry associated with a replaceable print apparatus component installed in a print apparatus, responding to a sensor data request received from the print apparatus by returning a first response; receiving a calibration parameter from the print apparatus; and returning a second response which is different from the first response.