Accessory Authentication via Usage Digest Verification
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Solution Overview
Problem
Counterfeit accessories used in medical devices can compromise patient safety and device functionality due to non-conformance with established operating parameters and physical characteristics, necessitating an effective detection method.
Innovation Solution
A system comprising a host controller, processor, and computer-readable storage medium that authenticates accessories by generating an expected usage digest based on an accessory's identifier and usage data, comparing it with a stored usage digest, and activating the accessory only if the comparison meets threshold values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If accessory authentication using usage digest verification is implemented, then patient safety and device functionality are improved, but device complexity and operational steps increase
Solution Approach 1:
The usage digest is pre-calculated and stored in the accessory's storage device during manufacturing or prior to use. This preliminary action allows the host controller to perform quick verification without complex real-time calculations, resolving the contradiction by preparing authentication data in advance to simplify the operational process while maintaining high reliability
Solution Approach 2:
The usage digest acts as an intermediary cryptographic verification element between the accessory and host controller. Instead of directly verifying complex accessory parameters or establishing trusted physical connections, the system uses the pre-computed usage digest as a mediator that proves authenticity through cryptographic comparison, thereby ensuring patient safety while keeping the authentication process manageable
2Measurement precision
If usage digest verification is performed for every accessory operation, then counterfeit detection accuracy is improved, but processing time and operational efficiency decrease
Solution Approach 1:
Instead of performing complex cryptographic verifications or physical inspections of the original accessory, the system uses a pre-computed usage digest (a cryptographic copy or representation of the accessory's identity and usage state) for verification. This copying approach maintains high counterfeit detection accuracy while significantly reducing processing time, as the host controller only needs to compare the provided usage digest against an expected value rather than performing exhaustive verification procedures
Solution Approach 2:
The usage digest is pre-calculated and stored in the accessory before use. This preliminary computation of the cryptographic verification value eliminates the need for time-consuming real-time calculations during accessory activation, thereby maintaining high detection accuracy while improving activation speed and operational efficiency
Data Source
AI summary
In one implementation, a system for detecting counterfeit accessories that are consumable, disposable, or otherwise user replaceable is disclosed. The system includes a host controller, a processor, and a computer-readable storage medium that includes instructions. Upon execution by the processor, the instructions cause the system to perform operations. The operations include obtaining an identifier of an accessory, a current value of usage data for the accessory, and a usage digest of the current value from a storage device associated with the accessory. An expected usage digest is generated based on the current value, the identifier, and a host secret. The expected usage digest is compared with the usage digest and the current value with a threshold usage value. The accessory is activated with the host controller responsive to the expected usage digest being identical to the usage digest and the current value satisfying the threshold usage value.