Semiconductor Die Authentication via Particle Beam Device Modification
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Solution Overview
Problem
Conventional techniques for protecting integrated-circuit chips against counterfeiting are inadequate, as advanced manufacturing capabilities allow counterfeiters to reverse-engineer and clone genuine chips, resulting in identical counterfeit chips that pass authentication based on physical characteristics.
Innovation Solution
The method involves modifying semiconductor devices on a chip's layer to alter their values, generating a unique numerical value based on these altered devices, which is stored in non-volatile memory for authentication purposes, making it impossible for cloned chips with uniform layers to pass authentication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional authentication methods based on physical characteristics are used, then authentication simplicity is maintained, but authentication reliability deteriorates because counterfeiters can reverse-engineer and clone genuine chips
Solution Approach 1:
The patent applies preliminary action by modifying semiconductor devices during the manufacturing process itself, before the chip is delivered to the customer. A particle beam (such as an electron beam or ion beam) is used to irradiate and alter the physical properties of semiconductor devices (such as changing the doping concentration or crystal structure) in a controlled manner. This creates unique, unobservable characteristics that are embedded into the chip during fabrication, establishing an authenticating feature set that cannot be replicated by counterfeiters who only have access to the final product.
Solution Approach 2:
The patent employs parameter changes by altering the physical or chemical parameters of semiconductor devices through particle beam irradiation. The irradiation process changes parameters such as doping concentration, carrier concentration, or defect density in the semiconductor material, which in turn changes the electrical characteristics (such as resistance, capacitance, or threshold voltage) of the affected devices. These parameter changes create unique, unobservable variations that serve as authenticating features, making the authentication method reliable against counterfeiting while maintaining relative simplicity in implementation.
2Reliability
If particle beam irradiation is applied to alter semiconductor device values, then authentication security is improved, but manufacturing complexity increases
Solution Approach 1:
The patent introduces an intermediary element in the form of a particle beam (electron beam or ion beam) that acts as a mediator between the manufacturing process and the semiconductor devices. This intermediary enables precise, localized modification of device properties without requiring direct physical contact or complex chemical processes. The particle beam can be controlled to irradiate specific regions of the chip, creating unique authentication features in a relatively straightforward manner that integrates with existing semiconductor fabrication workflows, thus improving authentication security while limiting the increase in manufacturing complexity.
3Object-affected harmful factors
If unique values are generated from unobservable devices, then counterfeiting prevention is enhanced, but measurement and detection difficulty increases
Solution Approach 1:
The patent applies the taking out principle by extracting or isolating specific semiconductor devices from the overall chip structure to serve as dedicated authentication elements. These selected devices are modified through particle beam irradiation to have unique, unobservable characteristics. The authentication system then reads out the values of only these specific devices (not the entire chip) to generate an authentication code. This approach enhances counterfeiting prevention by focusing on a small, controlled set of unobservable features while simplifying the measurement and detection process compared to analyzing the entire chip.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures that even cloned chips with identical metallic layers and memory data fail authentication, as the unique value generated from unobservable semiconductor devices cannot be replicated, effectively preventing counterfeiting.
Implementation Method 1
The method then varies an intensity of a particle beam applied to the exposed areas of the semiconductor layer effective to vary respective values of the devices
Data Source
AI summary
The present disclosure describes apparatuses and techniques for device-based die authentication. In some aspects, an intensity of a particle beam is varied during semiconductor processing to provide a semiconductor die having devices of varied values. In other aspects, different areas of semiconductor dies are exposed during semiconductor processing to provide semiconductor dies with devices that vary in value from one die to the next. For each semiconductor die, a value generated based on the values of the die's respective devices can be associated with that die thereby enabling subsequent authentication of the semiconductor die.