Ring Oscillator Correlation Detection for Interference Monitoring
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Solution Overview
Problem
Ring oscillators used as entropy sources in computer systems are vulnerable to interference, which can lead to synchronization and destruction of randomness, allowing unauthorized access to true random numbers, and existing solutions are expensive, fragile, and difficult to evaluate or design.
Innovation Solution
Implementing a system with multiple ring oscillators of identical design but varying frequencies, equipped with counters to detect correlations in their oscillation signals, generating notifications when interference is detected above a predefined threshold, thereby preventing harm to information security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical protection such as shields or filters is used to reduce interference sensitivity of ring oscillators, then reliability is improved, but device complexity and cost increase
Solution Approach 1:
The system divides the protection mechanism into multiple independent ring oscillators (at least two) that operate in parallel. Each oscillator is simple in structure, but collectively they provide interference detection through correlation analysis of their outputs, avoiding the need for complex physical shields or filters on individual oscillators.
Solution Approach 2:
The ring oscillators serve dual functions: they generate random numbers for cryptographic purposes and simultaneously act as sensors for interference detection. By monitoring the correlation between multiple oscillators' outputs, the system detects interference without requiring separate dedicated protection components.
2Reliability
If logic gates that are less sensitive to interference are used, then reliability is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The system uses multiple copies of the same standard ring oscillator design. Instead of designing specialized interference-resistant logic gates, the invention replicates identical oscillators and uses statistical correlation analysis to detect interference, simplifying the manufacturing process while maintaining reliability.
3Reliability
If multiple ring oscillators are used to detect interference through correlation analysis, then reliability is improved, but device complexity increases
Solution Approach 1:
The system continuously monitors the correlation between ring oscillator outputs and uses this feedback to detect interference. When correlation exceeds a threshold, the system identifies potential interference and can take appropriate actions, creating a self-monitoring system that improves reliability without requiring complex external control mechanisms.
Data Source
AI summary
A system for providing security in a computer system is provided. The system includes a plurality of ring oscillators and one or more logic circuits. The ring oscillators are equipped with a respective plurality of counters to count impulses of oscillating outputs of the ring oscillators. The one or more logic circuits start and stop the respective plurality of counters over repeated counting periods, and select a group of ring oscillators from the plurality of ring oscillators. The one or more logic circuits also determine a correlation between oscillating outputs of the group of ring oscillators. The one or more logic circuits further generate a notification indicating interference in the group of ring oscillators and thereby the plurality of ring oscillators when the correlation is above a predefined threshold correlation.