Frequency Modulation Detection in Secure Time Base
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Solution Overview
Problem
Electronic systems, particularly those using cryptographic engines like AES, are vulnerable to tampering and clock manipulation attacks that compromise security by altering the frequency of secure time bases, allowing unauthorized access to sensitive information.
Innovation Solution
A monitoring system and method within an electronic system that detects frequency manipulation of a secure time base by measuring the voltage supply to a protected circuit block and comparing it to a threshold, using a voltage detector and comparator to identify deviations, and triggering countermeasures when tampering is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage monitoring is implemented to detect frequency manipulation, then security against clock manipulation attacks is improved, but device complexity increases due to additional monitoring components
Solution Approach 1:
The voltage detector utilizes the existing voltage supply infrastructure to detect frequency manipulation attacks. The monitoring system leverages the natural relationship between charging clock frequency and voltage levels without requiring external monitoring equipment, allowing the system to monitor itself for security threats.
Solution Approach 2:
The patent introduces a voltage detector and comparator as intermediary components that translate frequency manipulation effects into detectable voltage variations. These intermediaries bridge the gap between the charging clock signal and the protected circuit block, enabling indirect detection of attacks through voltage monitoring.
2Measurement precision
If continuous voltage monitoring is performed to detect frequency manipulation, then detection capability is improved, but use of energy increases due to continuous monitoring operations
Solution Approach 1:
The voltage monitoring operates continuously during the charging phase to ensure uninterrupted detection of frequency manipulation attempts. The comparator continuously compares voltage levels against reference thresholds, maintaining constant surveillance without interruption to detect even transient attacks.
Solution Approach 2:
The monitoring system implements feedback by comparing the measured voltage against expected voltage ranges and triggering alerts when deviations indicate frequency manipulation. This feedback mechanism enables real-time detection and response to security threats while optimizing energy usage based on actual monitoring needs.
Data Source
AI summary
An electronic system can include a charge storage device controllably connected to a voltage source; a protected circuit block controllably connected to the charge storage device for receiving a voltage supply from the charge storage device, the protected circuit block operating via an operating clock signal; a voltage detector coupled to the voltage supply of the protected circuit block; a comparator coupled to an output of the voltage detector; and a countermeasure processor coupled to receive an alert signal from an output of the comparator. The voltage at the voltage supply is related to the frequency of the operating clock and a frequency manipulation attack is detected by monitoring a difference between the voltage supply and a comparison voltage.