Optical PUF Key Stability via Interferometer Integration
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Solution Overview
Problem
Existing physical uncloneable functions (PUFs) are sensitive to environmental changes and device degradation, leading to unauthorized locking or unlocking of chips or systems due to manufacturing variations, which compromises security.
Innovation Solution
Incorporating an optical physical uncloneable function (PUF) device in circuit designs that uses optical interferometers or ring resonators to generate unique keys based on manufacturing variations, remaining stable across various operational environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional PUFs are used that rely on subtle manufacturing variations, then key uniqueness is achieved, but the PUF becomes sensitive to environmental changes and device degradation causing unauthorized locking or unlocking
Solution Approach 1:
The patent replaces conventional electronic PUF implementations with an optical PUF system that uses optical interferometers and ring resonators. This substitution leverages optical properties (refractive index, resonance frequency) that are inherently more stable against environmental variations like temperature and voltage changes, thereby achieving key stability without the harmful environmental sensitivity that plagues conventional PUFs
Solution Approach 2:
The patent changes the physical parameter domain from electrical to optical. By encoding keys in optical characteristics (such as resonance wavelengths or interference patterns) rather than electrical states, the system achieves immunity to electrical environmental variations while maintaining manufacturing variation-based uniqueness. This parameter transformation fundamentally resolves the reliability-environmental sensitivity contradiction
2Reliability
If write-once memory is used to store unique keys, then key uniqueness is provided, but key anonymity is lost allowing copies to be made with compromised keys
Solution Approach 1:
The optical PUF system performs self-service by automatically generating unique keys through its inherent manufacturing variations without requiring external programming or key storage. The key is emergent from the physical structure itself, making it impossible to copy or compromise without physically altering the device, thereby maintaining both uniqueness and anonymity
Solution Approach 2:
By replacing programmable memory with optical PUF physics, the system eliminates the key anonymity problem. The optical PUF's manufacturing variations create keys that are physically embedded in the device structure, making them不可复制 (uncopyable) and maintaining anonymity even if the key generation mechanism were somehow compromised
3Reliability
If optical PUFs are used to provide environment-independent security, then key stability is improved, but device complexity increases due to optical components
Solution Approach 1:
The patent merges the optical PUF functionality directly into the existing semiconductor device structure. The optical interferometers and ring resonators are integrated alongside standard circuit elements, combining security functionality with the main device rather than adding separate standalone optical components. This integration approach achieves environmental stability while minimizing the complexity penalty
Solution Approach 2:
The optical PUF structure serves multiple functions: it provides key generation, environmental stability, and security authentication simultaneously. By making the optical components multi-functional (structural + security + stability), the system reduces the need for additional dedicated components, thereby managing complexity while achieving reliable environment-independent operation
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
The optical PUFs provide robust, environment-independent hardware-based security by generating unique keys, ensuring secure operation and authentication of electronic devices despite manufacturing process consistency.
Implementation Method 1
an optical physical uncloneable function (PUF) device in a circuit design. The optical PUF can include an optical interferometer
Implementation Method 2
optical interferometers or ring resonators to generate unique keys
Data Source
AI summary
This application discloses a computing system implementing tools and mechanisms that can incorporate an optical physical uncloneable function (PUF) device in a circuit design. The optical physical uncloneable function device can generate at least a portion of a key. The tools and mechanisms can interconnect the optical physical uncloneable function device with a security control device in the circuit design, wherein the security control device is configured to initiate a security action when the key matches an expected key in the security controller.