Imaging Sensor Key Generation via Statistical Moment Analysis
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Solution Overview
Problem
Existing methods for securing imaging sensors in consumer electronics devices lack effective approaches for generating reliable credentials or keys, which are essential for authentication and data protection.
Innovation Solution
A method that challenges a subset of sensor components under uniform conditions, determines statistical moments of their temporal distributions, and identifies pathological components whose distances exceed a threshold, leveraging these components for key generation and authentication mechanisms without requiring additional hardware integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing authentication approaches are used, then user authentication is enabled, but the imaging sensor itself is not secured or authenticated
Solution Approach 1:
The imaging sensor uses its own inherent manufacturing variations and physical properties to generate authentication credentials, eliminating the need for separate authentication hardware. The sensor components themselves serve as the authentication mechanism by providing unique electrical characteristics that can be measured and converted into cryptographic keys.
Solution Approach 2:
The imaging sensor performs dual functions: capturing images and generating authentication credentials. The same sensor components used for image detection are also utilized for security authentication, making the device multi-functional without adding separate authentication hardware.
2Reliability
If additional hardware is integrated for key generation, then reliable credentials can be generated, but manufacturing costs increase
Solution Approach 1:
The imaging sensor generates its own authentication keys using its inherent physical properties and manufacturing variations, without requiring additional dedicated hardware components. This self-service approach eliminates extra manufacturing steps and component costs while maintaining reliable key generation.
Solution Approach 2:
Instead of creating new hardware for key generation, the system copies/utilizes the existing sensor component characteristics (electrical properties, manufacturing variations) to generate cryptographic keys, transforming existing physical properties into security credentials without additional hardware.
3Adaptability or versatility
If sensor components are challenged under varying conditions, then comprehensive testing is achieved, but key generation reliability decreases
Solution Approach 1:
The patent applies different challenge conditions to different subsets of sensor components based on their specific characteristics. Rather than uniformly challenging all components, the system selectively applies challenges appropriate to each component's local properties, ensuring both comprehensive testing and reliable key generation from suitable components.
Solution Approach 2:
The sensor array is divided into multiple subsets or groups of components, each evaluated independently under appropriate challenge conditions. This segmentation allows comprehensive testing of different component types while maintaining reliable key generation from the most suitable subsets, isolating variations that might affect overall reliability.
Data Source
AI summary
There is disclosed a method of handling a sensor, comprising the steps of: challenging a subset of sensor components under uniform conditions; receiving output signal values from said subset; for each component, determining the statistical moment of order i of the temporal distribution of the output signal value of said each sensor component; and determining one or more pathological sensor components whose sum of the distances of values to other components of the subset is greater than a threshold, the distance between two sensor components being determined by the difference of the ith statistical moment values of the two temporal distributions associated to the components obtained when challenging said subset under uniform conditions. Described developments comprise the use of imaging sensors, key or identifier generation, authentication mechanisms, determination of thresholds, use of helper data files, adjustments of light sources and/or beam shaping, handling of lossy compression and of videos.