Unit Verification Method Using Physical Properties for Authentication
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Solution Overview
Problem
Existing PUF-based authentication and verification methods are vulnerable to counterfeiting and tampering, as dedicated ICs can be removed or replicated, failing to provide sufficient security in critical applications like aircraft safety systems.
Innovation Solution
The proposed method utilizes the assembled unit under test (UUT) as the basis for generating a unique key, leveraging its inherent physical properties and manufacturing tolerances, without requiring bespoke circuitry, by applying challenge signals and measuring responses to create a registration and authentication key, which is difficult to replicate or tamper with.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dedicated IC PUF is used for authentication, then unique identification is achieved, but the system becomes vulnerable to removal and replication attacks
Solution Approach 1:
The patent merges the PUF functionality with the main unit under test itself, rather than using a separate dedicated IC. The unit under test is challenged with test signals and its responses are used to generate the authentication key, making the authentication capability intrinsic to the unit and impossible to separate or replicate independently
Solution Approach 2:
The patent introduces an intermediary process where the unit under test is challenged with test signals during both registration and authentication phases. This intermediary challenge-response mechanism creates a binding between the physical characteristics of the unit and its authentication credentials, preventing direct copying
2Ease of operation
If PUF responses are read out and copied, then authentication keys can be replicated, but security is compromised
Solution Approach 1:
The patent performs a preliminary registration phase where the unit under test is challenged and its responses are stored as reference data. This preliminary action establishes the binding between the unit's physical characteristics and its authentication credentials before any authentication attempts occur
Solution Approach 2:
The patent changes the parameters of the challenge signals applied to the unit under test between registration and authentication phases. By varying the test signals and measurement conditions, the system ensures that responses cannot be directly copied and require re-measurement, preventing simple replication attacks
3Reliability
If analogue properties are used for key generation, then digital replication becomes impossible, but measurement precision requirements increase
Solution Approach 1:
The patent creates a digital copy of the analogue challenge-response behavior during registration, storing the reference responses in a database. This allows the system to compare future authentication responses against the stored reference without requiring direct analogue measurement, reducing precision requirements while maintaining security
Solution Approach 2:
The patent substitutes direct analogue measurement and comparison with a digital processing approach. Challenge signals are applied digitally, responses are measured and converted to digital data, and authentication is performed through digital comparison of challenge-response pairs, replacing complex analogue verification with more manageable digital processing
Data Source
AI summary
A unit verification method to be performed on a unit under test (UUT) comprises connecting a verification device to the UUT. The verification device applies a set of challenge signals to the UUT and then measures the responses of the UUT to the challenge signals. The responses of the UUT are based on the challenge signals and the physical properties of the UUT. A registration key is generated based on the measured responses and is stored. The registration key is unique to the UUT.