Image Sensor OB Pixel PUF Key Generation
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Solution Overview
Problem
Existing systems for electronic device authentication, such as those using IMEI or MAC addresses, are vulnerable to duplication, cloning, and spoofing, leading to uncertainty in device uniqueness.
Innovation Solution
A method utilizing a complementary metal oxide semiconductor (CMOS) image sensor to generate a physically unclonable function (PUF) key based on optical black (OB) pixels, which are insensitive to light, to provide authentication without external hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional unique IDs (IMEI, IMSI, MAC address) are used for device authentication, then device identification is simple and straightforward, but the authentication security is weak due to vulnerability to duplication, cloning, and spoofing
Solution Approach 1:
The image sensor performs self-authentication by utilizing its own inherent physical characteristics (OB pixel variations) to generate a unique PUF key, eliminating the need for external authentication hardware or systems. The sensor serves both as the authentication object and the authentication mechanism simultaneously.
Solution Approach 2:
The patent replaces traditional software-based authentication mechanisms (IMEI, MAC addresses) with a physics-based authentication system that leverages the inherent physical variations in OB pixel dark current characteristics, making the authentication unclonable and secure.
2Reliability
If external hardware is added to enhance authentication security, then authentication reliability improves, but device complexity and cost increase
Solution Approach 1:
The image sensor is designed to serve multiple functions: it acts as both the imaging device and the authentication source. By utilizing the existing OB pixels within the sensor array, the system achieves dual functionality without requiring separate authentication hardware components.
Solution Approach 2:
The authentication system leverages the image sensor's own physical characteristics (inherent variations in OB pixel dark current) to generate the PUF key, eliminating the need for external authentication hardware. The sensor authenticates itself using its inherent physical properties.
3Reliability
If PUF key generation uses multiple frames and intersection operations, then the uniqueness and unclonability of the PUF key improves, but the processing time and computational complexity increase
Solution Approach 1:
The system performs preliminary processing by capturing multiple frames and identifying candidate OB pixels in advance, storing their location information for subsequent intersection operations. This pre-processing approach optimizes the overall PUF key generation efficiency by organizing data before the critical intersection computation.
Solution Approach 2:
The system processes more frames than the minimum single frame, using multiple frames to capture OB pixel variations. This excessive action (processing additional frames beyond the theoretical minimum) enhances the reliability and uniqueness of the PUF key by providing more data for the intersection operation to identify consistent OB pixels across different temporal conditions.
Data Source
AI summary
A method for providing authentication using an image sensor of an electronic device including: receiving, by the electronic device, a plurality of frames from the image sensor of the electronic device, wherein each frame includes a plurality of Optical Black (OB) pixels; determining, by the electronic device, a set of optimal OB pixels from the plurality of frames; and generating, by the electronic device, a unique key based on the set of optimal OB pixels for the authentication.