Bond Wire Cage for IC Package Tamper Detection
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Solution Overview
Problem
Integrated circuit devices, particularly those storing cryptographic keys or performing secure transactions, are vulnerable to physical attacks where the device enclosure is compromised, lacking effective package-level security combining logical and physical protection with active tamper detection.
Innovation Solution
The implementation of a bond wire cage and staggered pad configuration with embedded protection circuits and tamper detection mechanisms, along with a board-level mesh and die-level mesh protection, to create a multi-layered security system that detects and prevents physical attacks from various angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional package protection techniques are used, then manufacturing is simpler and cost is lower, but security against physical attacks is insufficient
Solution Approach 1:
The patent implements a nested security structure where a mesh layer is embedded within the package encapsulant, creating concentric protection layers. The mesh is positioned between the encapsulant outer surface and the IC die, forming a nested configuration that progressively blocks attack vectors at multiple depths within the package structure.
Solution Approach 2:
The security mesh is divided into multiple conductive segments or zones that can be independently monitored. This segmentation allows the system to detect tampering at specific locations and provides redundant detection paths, enhancing security while maintaining manageable complexity in the package structure.
2Reliability
If no embedded security measures are implemented, then device complexity is lower, but vulnerability to enclosure attacks increases
Solution Approach 1:
The mesh structure incorporates conductive elements connected to detection circuits that provide real-time feedback on the integrity of the package encapsulant. When the mesh is distorted or broken due to tampering, the detection circuit receives a signal change and can trigger security responses such as alerting or erasing sensitive data.
Solution Approach 2:
The security mesh is pre-installed and activated within the package encapsulant during manufacturing, before any potential tampering attempts. This preliminary placement ensures that the detection system is already in position to detect and respond to enclosure attacks, rather than requiring post-manufacturing installation.
3Reliability
If attackers can access device internals easily, then ease of operation for legitimate access is higher, but security against probing and signal manipulation is compromised
Solution Approach 1:
The mesh structure provides enhanced protection specifically at critical locations where signal bonds connect to the IC die. The mesh density and configuration can be optimized locally at these vulnerable points, providing targeted signal protection without unnecessarily complicating the entire package structure.
Data Source
AI summary
Systems and methods for embedded tamper mesh protection are provided. The embedded tamper mesh includes a series of protection bond wires surrounding bond wires carrying sensitive signals. The protection bond wires are positioned to be vertically higher than the signal bond wires. The protection wires may be bonded to outer contacts on the substrate while the signal bond wires are bonded to inner contacts, thereby creating a bond wire cage around the signal wires. Methods and systems for providing package level protection are also provided. An exemplary secure package includes a substrate having multiple contacts surrounding a die disposed on an upper surface of the substrate. A mesh die including a series of mesh die pads is coupled to the upper surface of the die. Bond wires are coupled from the mesh die pads to contacts on the substrate thereby creating a bond wire cage surrounding the die.