Antifuse-Based IC Security Against Ion Beam Attacks
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Solution Overview
Problem
Integrated circuits, particularly those with sensitive information, face challenges in protecting against attacks using focused ion beams or electron beams, as existing solutions like detecting transistor leakage variations are difficult to implement effectively.
Innovation Solution
The integration of an electrically conductive body at a floating potential within the integrated circuit, coupled with an antifuse device that grounds the module's output when a threshold voltage is exceeded, preventing data retrieval during an attack by forming a permanent conductive path to ground.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transistor leakage current variation detection is used to protect integrated circuits, then security against attacks is improved, but device complexity and implementation difficulty increase
Solution Approach 1:
The patent extracts the protection function from complex transistor leakage detection and implements it through a simple antifuse device that grounds the output when a threshold is exceeded, eliminating the need for complex monitoring circuits while maintaining security
Solution Approach 2:
The patent changes the protection mechanism from detecting small electrical parameter variations (leakage current) to detecting large parameter changes (threshold voltage exceeded by charge accumulation), making the protection both simpler to implement and more reliable
2Measurement precision
If an electrically conductive body at floating potential is used to detect attacks, then detection capability is improved, but device complexity increases
Solution Approach 1:
The electrically conductive body automatically accumulates charge during an attack and self-triggers the grounding action through the antifuse device without requiring external monitoring or control circuits, achieving both high detection capability and simplicity
Solution Approach 2:
The conductive body is pre-configured at floating potential during manufacturing, ready to immediately accumulate charge and trigger protection upon attack, eliminating the need for complex real-time monitoring systems
3Reliability
If antifuse device is used to ground module output, then protection effectiveness is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent exploits the natural parameter of antifuse breakdown voltage as the protection threshold, transforming a manufacturing precision challenge into a design advantage where the inherent physical property provides the triggering mechanism
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 method effectively protects the integrated circuit by ensuring that if an attack induces a voltage higher than the threshold, the antifuse device transitions to a conductive state, grounding the module's output and rendering stored information inaccessible, thus safeguarding sensitive data.
Implementation Method 1
producing, in the integrated circuit, an electrically conductive body at a floating potential and holding an initial amount of electric charge
Implementation Method 2
said antifuse device being configured to transition irreversibly from a first state corresponding to an open circuit to a second state corresponding to a closed circuit if the voltage applied to said terminal and resulting from said amount of charge that is higher than said threshold is higher than a breakdown voltage of said antifuse device
Data Source
AI summary
An integrated circuit includes a circuit module storing sensitive data. An electrically conductive body at a floating potential is located in the integrated circuit and holds an initial amount of electric charge. In response to an attack attempting to access the sensitive data, electric charge is collected on the electrically conductive body. A protection circuit is configured to ground an output of the circuit module, and thus preclude access to the sensitive data, in response to collected amount of electric charge on the electrically conductive body differing from the initial amount and exceeding a threshold.