Power Supply Partial Discharge for Cryptographic Security
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Solution Overview
Problem
Existing power supply systems for processing circuitry, such as cryptographic systems, are vulnerable to power analysis attacks where an attacker can determine sensitive information by analyzing power consumption patterns.
Innovation Solution
A power supply system that includes discharge circuitry to partially discharge the power supply after each processing operation, obscuring the amount of charge used by converting it into heat, thereby making it difficult for external observers to determine the power usage and impeding predictive analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the power supply is fully discharged after processing operation, then the processing circuitry can efficiently utilize all available charge, but the amount of charge used becomes detectable and vulnerable to power analysis attacks
Solution Approach 1:
The patent applies partial action by intentionally leaving residual charge in the power supply capacitor after processing operations complete. Instead of fully discharging the capacitor to maximize efficiency, the system deliberately maintains a threshold voltage level, thereby obfuscating the actual charge consumption and preventing accurate power analysis attacks while still achieving effective power utilization.
2Object-affected harmful factors
If the power supply is partially discharged to maintain security, then power analysis attacks are impeded, but the charge utilization efficiency decreases
Solution Approach 1:
The system dynamically adjusts the discharge threshold voltage parameter based on operational requirements. By changing this parameter, the system can balance between security (higher threshold for better obfuscation) and efficiency (lower threshold for better charge utilization), allowing flexible optimization of the contradiction between power analysis resistance and charge efficiency.
3Device complexity
If a fixed threshold discharge value is used, then the discharge process is simple and consistent, but it may not adapt to different processing operations with varying power requirements
Solution Approach 1:
The patent implements dynamic threshold adjustment where the discharge threshold voltage is not fixed but varies based on the specific processing operation being performed. This allows the system to adapt to different power requirements of various operations while maintaining relatively simple discharge control logic, resolving the contradiction between simplicity and adaptability.
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
The system effectively protects against power analysis side channel attacks by maintaining or varying a threshold discharge value, ensuring that the power usage appears consistent regardless of the processing operation, thus enhancing security, especially in cryptographic operations.
Implementation Method 1
the discharge circuitry is adapted to partially discharge the power supply by acting as a resistor... partially discharges the power supply by converting electrical power into heat
Data Source
AI summary
An apparatus and method are provided for partially discharging a power supply, the apparatus comprising a power supply adapted to supply power to processing circuitry to perform a processing operation and discharge circuitry adapted to partially discharge the power supply after the processing operation is complete.