PUF-Based Authentication Binding Metadata to Hardware
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Solution Overview
Problem
Authentication systems relying on biometric data and physical unclonable functions (PUFs) face challenges such as vulnerability to forged sensor output, exposure of sensitive data, and inability to change compromised biometric information, while existing methods do not effectively link PUFs with authentication protocols or handle non-sensitive metadata.
Innovation Solution
An authentication system that generates an enrollment token or public key based on intrinsic device characteristics, including PUF data, and incorporates sensitive metadata using hash functions, enabling zero knowledge proofs for device verification without exposing sensitive information, and handles non-sensitive metadata to ensure authentication integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If biometric data is used for authentication, then authentication security is improved, but vulnerability to forged sensor output and data exposure increases
Solution Approach 1:
The patent introduces a PUF-based authentication mechanism as an intermediary between the sensor and the authentication decision. The PUF generates a unique response based on hardware characteristics, which is then combined with sensor data through a challenge-response protocol. This intermediary layer verifies that the sensor output is genuine and has not been forged, while the unique PUF response ensures that even identical sensor data cannot be reused across different devices or sessions.
Solution Approach 2:
The patent replaces traditional mechanical or software-based authentication mechanisms with a physics-based PUF approach. Instead of relying on software encryption or database storage of biometric data, the system uses physical hardware characteristics (such as transistor timing variations, voltage drops, or thermal properties) that are inherently difficult to replicate. This substitution fundamentally changes how authentication is performed, moving from information-theoretic security to physical-unclonable security.
2Ease of operation
If biometric data is stored for authentication, then authentication capability is improved, but exposure and loss of sensitive biometric data occurs
Solution Approach 1:
The patent extracts the sensitive biometric data from the authentication process by using it only as input to generate a challenge-response pair. The actual biometric template is never stored or transmitted; instead, only the derived PUF response and challenge-response pairs are used for authentication. This extraction eliminates the storage vulnerability while maintaining authentication capability, as the system can still verify identity through the challenge-response mechanism without retaining the original biometric data.
Solution Approach 2:
The patent performs preliminary transformation of biometric data into a PUF-based authentication token during device enrollment. This preliminary action converts the sensitive biometric information into a form that cannot be reversed or exposed. The biometric data is used once to establish the unique PUF response, after which only the hashed response is stored and used for subsequent authentication attempts, preventing any future exposure of the original biometric data.
3Reliability
If PUF is used for device authentication, then device identity uniqueness is improved, but linking PUF with authentication protocols and handling metadata becomes complex
Solution Approach 1:
The patent merges the PUF authentication mechanism with metadata handling by combining the PUF response with challenge data, sensor output, and metadata into a unified authentication token. This merging process integrates multiple data sources (device identity, challenge, sensor data, and metadata) into a single cryptographic structure that can be verified together. The combination is achieved through cryptographic hashing and encoding, which links all components while maintaining the uniqueness provided by the PUF.
Solution Approach 2:
The patent creates a universal authentication protocol that can handle multiple types of data (sensor output, metadata, biometric data) through a single PUF-based challenge-response mechanism. The same PUF infrastructure supports both device authentication and user authentication, as well as both sensitive and non-sensitive data handling. This multi-functionality reduces overall system complexity by using one versatile mechanism rather than separate specialized systems for each authentication scenario.
Data Source
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AI summary
A system, device, and method for binding metadata, such as information derived from the output of a biometric sensor, to hardware intrinsic properties by obtaining authentication-related metadata and combining it with information pertaining to a root of trust, such as a physical unclonable function. The metadata may be derived from a sensor such as a biometric sensor, the root of trust may be a physical unclonable function, the combination of the metadata and root of trust information may employ a hash function, and output from such a hash process may be used as an input to the root of trust. The combined information can be used in interactive or non-interactive authentication.