IC Voltage Attack Detection Under Clock Jitter
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Solution Overview
Problem
Electronic devices, particularly integrated circuits (ICs), face challenges in detecting voltage-based attacks under clock fluctuations, as frequency fluctuations intended to combat physical attacks complicate the differentiation between voltage variations caused by attacks and natural clock signal delays.
Innovation Solution
The implementation of two voltage-dependent circuits with different sensitivities, which produce signals that react differently to voltage variations but similarly to clock fluctuations, allowing for the neutralization of clock fluctuation effects and detection of voltage-based attacks through a combined signal analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clock fluctuations are introduced to combat physical attacks, then security against unauthorized access is improved, but the ability to detect voltage-based attacks deteriorates due to difficulty in differentiating voltage variations from clock signal delays
Solution Approach 1:
The detection system is divided into multiple independent voltage-dependent circuits (first voltage-dependent circuit and second voltage-dependent circuit) that process clock signals separately. Each circuit produces its own signal that can be independently analyzed, allowing the system to segment the detection task and compare results to identify voltage attacks versus clock fluctuations.
Solution Approach 2:
The patent changes the voltage sensitivity parameter of the voltage-dependent circuits by using circuits with different sensitivities to voltage variations. This parameter differentiation allows the system to detect voltage-based attacks while being less susceptible to clock signal frequency fluctuations, as the circuits respond differently to voltage changes but similarly to clock variations.
2Difficulty of detecting and measuring
If voltage-based attack detection is implemented using voltage-dependent circuits, then detection capability is improved, but the circuits become vulnerable to false positives from clock signal frequency fluctuations
Solution Approach 1:
The system uses feedback by comparing the outputs of multiple voltage-dependent circuits that have different voltage sensitivities. The voltage analysis circuit receives signals from both circuits and uses this feedback mechanism to distinguish between genuine voltage-based attacks and normal clock signal variations, thereby reducing false positives while maintaining detection accuracy.
Solution Approach 2:
The patent introduces asymmetry by using voltage-dependent circuits with deliberately different voltage sensitivities. This asymmetric design ensures that voltage-based attacks produce distinguishable effects on each circuit, while clock signal fluctuations affect both circuits in a more uniform manner, enabling the system to differentiate between attack types.
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 enables effective detection of voltage-based attacks even in the presence of clock fluctuations, enhancing the security of ICs by accurately identifying and responding to unauthorized voltage changes.
Implementation Method 1
a first voltage-dependent circuit configured to produce a first signal that is indicative of a voltage level responsive to the clock signal and based on a first voltage sensitivity; a second voltage-dependent circuit configured to produce a second signal that is indicative of a voltage level responsive to the clock signal and based on a second voltage sensitivity
Data Source
AI summary
Detecting voltage-based attacks on an integrated circuit (IC) is difficult in the presence of clock jitter. Propagating signals can exhibit a total delay that is due to a delay component resulting from a voltage-based attack and a delay characteristic resulting from clock fluctuation. Voltage-variation detection circuitry includes first and second voltage-dependent circuits and a voltage analysis circuit. The voltage-dependent circuits produce first and second signals that are indicative of a voltage level responsive to a clock signal and based on different first and second voltage sensitivities. The voltage analysis circuit generates a voltage alert signal based on the first and second signals. A combined signal neutralizes the delay characteristic in the first and second signals, but the delay component due to the voltage variation can be at least partially maintained. Thus, a voltage-based attack is detectable in the presence of clock fluctuation by using two voltage-dependent circuits.