Clock Edge Counting for IC Security Violation Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Integrated circuits are vulnerable to security breaches caused by attackers manipulating the clock edges of external clock signals, leading to logic failures and potential unauthorized access to secure information.
Innovation Solution
An apparatus and method that include a clock generator, counter, and controller to detect potential security violations by monitoring variations in the count of clock signal cycles, and prevent access to secure components if a violation is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the integrated circuit uses an external clock signal, then the circuit can operate with standard clocking, but the circuit becomes vulnerable to clock edge manipulation attacks
Solution Approach 1:
The patent implements preliminary detection of clock signal integrity by counting clock edges and comparing against expected values before allowing cryptographic operations to proceed. This preliminary check prevents manipulated clock signals from causing security violations.
Solution Approach 2:
The system continuously monitors clock signal characteristics by counting edges and providing feedback to a control mechanism. When the count deviates from expected values, the system responds by preventing access to secure functions, creating a closed-loop security mechanism.
2Object-affected harmful factors
If the clock edge location is moved to exploit security, then unauthorized access may be achieved, but the clock signal integrity is compromised
Solution Approach 1:
The system performs preliminary validation of clock signal integrity by counting edges before allowing operations that could be affected by manipulation. This prevents exploited clock signals from compromising security.
Solution Approach 2:
The patent introduces an intermediary detection mechanism that stands between the clock signal and the cryptographic circuitry. This intermediary counts clock edges and validates integrity, acting as a mediator that blocks manipulated signals from reaching sensitive operations.
3Reliability
If a counter and controller are added to detect clock anomalies, then security violations can be detected, but the device complexity increases
Solution Approach 1:
The counter circuit serves multiple functions: it counts clock edges for integrity verification, provides timing information for cryptographic operations, and enables detection of manipulation attempts. This multi-functionality reduces the need for separate dedicated security circuits.
Solution Approach 2:
The system uses existing clock signal infrastructure and standard digital logic components (counters, comparators) that are already present or easily integrated into typical digital circuits. The security detection leverages the clock signal itself rather than requiring entirely separate monitoring infrastructure.
Data Source
AI summary
In one embodiment, an apparatus includes: a clock generator to receive a reference clock signal and generate a first clock signal using the reference clock signal; a counter coupled to the clock generator to maintain a first count regarding a number of cycles of the first clock signal; and a controller coupled to the counter. The controller may be configured to detect a potential security violation when the first count varies from a predetermined value.