Pseudo-Random Signal Tamper Detection Integrated Circuit
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Solution Overview
Problem
Existing tamper detection systems in electronic devices are not tamper-proof and can be compromised, as they rely on physical barriers that may be overcome or bypassed, lacking effective digital continuity monitoring.
Innovation Solution
An integrated circuit with signal generator and comparator circuitry that generates a pseudo-random digital signal and compares input signals to detect tampering, using Boolean logic and delay mechanisms to provide a tamper detection signal, which triggers corrective actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical barriers or enclosures are used to prevent unauthorized access, then device security is improved, but these methods are not tamper-proof and can be compromised
Solution Approach 1:
The patent replaces physical barrier mechanisms with a digital signal-based tamper detection system. Instead of relying solely on mechanical enclosures, the system uses pseudo-random digital signals transmitted through conductive paths to detect tampering digitally, substituting mechanical security with electronic verification methods.
Solution Approach 2:
The system creates a digital copy of the expected signal behavior by generating pseudo-random sequences at both the transmitter and receiver ends. By comparing the received signal against the locally generated copy, the system can verify integrity without adding complex external verification hardware.
2Reliability
If digital continuity monitoring is implemented, then tamper detection capability is improved, but the system complexity increases
Solution Approach 1:
The tamper detection system is integrated into existing communication circuits, allowing the same conductive paths and signal processing circuits to serve both data communication and security monitoring functions. This multi-functionality approach avoids adding separate dedicated security hardware.
Solution Approach 2:
The system uses its own communication infrastructure to perform tamper detection. The pseudo-random signal is generated, transmitted, and verified using the existing circuitry, making the security system self-contained and eliminating the need for external monitoring equipment.
3Measurement precision
If pseudo-random digital signal comparison is used, then tamper detection accuracy is improved, but signal processing complexity increases
Solution Approach 1:
The system changes the temporal parameters of the signal by introducing controlled delays to the pseudo-random sequence. By comparing the delayed local signal with the received signal, the system achieves accurate tamper detection while managing complexity through parameter adjustment rather than complex processing algorithms.
Solution Approach 2:
The pseudo-random signal is generated and compared in periodic cycles, allowing the system to continuously monitor for tampering events. This periodic operation simplifies the processing requirements compared to continuous analysis, as the system only needs to perform comparison operations at discrete time intervals.
Data Source
AI summary
An integrated circuit including an input terminal and an output terminal, signal generator circuitry that generates a pseudo-random digital signal provided at the output terminal, and comparator circuitry that compares an input signal received via the input terminal with the pseudo-random digital signal for providing a tamper detection signal indicative thereof. The signal generator circuitry may be a pseudo-random binary sequence generator or may be a linear-feedback shift register with software triggered reloading. The comparator circuitry may include a Boolean logic exclusive-OR gate for comparing the output and input signals. A method of detecting tampering including generating and providing a pseudo-random digital signal at an output terminal and comparing an input signal received via an input terminal with the pseudo-random digital signal for providing a tamper detection signal indicative thereof.