Integrated Circuit Decoy Structure for Reverse Engineering Resistance
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Solution Overview
Problem
Integrated circuits are vulnerable to reverse engineering due to the ease with which their components can be identified and understood, necessitating the incorporation of decoy structures that mimic functional components without actually being operational.
Innovation Solution
Incorporation of decoy structures within the integrated circuit, specifically a silicided sector electrically isolated from the substrate, which appears as operational components like transistors or resistors but lacks electrical contact, thereby misleading reverse engineers and maintaining the functionality of neighboring components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If decoy structures are incorporated into the integrated circuit to complicate reverse engineering, then the security against reverse engineering is improved, but the device complexity increases
Solution Approach 1:
The patent creates decoy structures that are visual copies of functional components (transistors, resistors, capacitors) but lack actual electrical functionality. These decoys mimic the appearance and layout of real components when viewed from above, confounding reverse engineering efforts while adding minimal structural complexity since they share the same fabrication processes as functional components
Solution Approach 2:
The patent introduces an intermediate isolating layer (such as a nitride layer or CESL) between the substrate and the interconnection part that selectively isolates specific silicided sectors. This intermediary layer enables the creation of decoy structures by blocking electrical contact to selected areas while maintaining the overall circuit architecture and fabrication simplicity
2Object-affected harmful factors
If decoy structures are added to mislead reverse engineers, then the security is enhanced, but the manufacturing complexity increases
Solution Approach 1:
The patent performs preliminary actions during standard fabrication steps by selectively siliciding certain substrate areas before forming the isolating layer. This preliminary silicidation creates the basis for decoy structures using existing fabrication capabilities, avoiding the need for additional complex manufacturing steps while achieving the security enhancement
Solution Approach 2:
The patent changes the electrical isolation parameter of specific regions by introducing the nitride layer or CESL at controlled locations. This parameter change (from conductive to isolated) transforms functional-looking structures into non-functional decoys without requiring fundamental changes to the manufacturing process, maintaining ease of construction
3Object-affected harmful factors
If silicided sectors are electrically isolated from the substrate to create decoys, then the deception effect is improved, but the risk of affecting neighboring components increases
Solution Approach 1:
The patent applies local quality by selectively isolating only specific silicided sectors that are intended to be decoys, while leaving other areas electrically connected to the substrate. The isolating layer is precisely positioned to affect only the target regions, ensuring that functional components retain their electrical connectivity and performance while decoys achieve their deceptive effect
Data Source
AI summary
An integrated circuit includes a substrate, an interconnection part, and an isolating region located between the substrate and the interconnection part. A decoy structure is located within the isolating region and includes a silicided sector which is electrically isolated from the substrate.