Secure Power Supply Buffer for Stable Crypto Voltage
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Solution Overview
Problem
Existing secure systems face challenges in preventing hackers from obtaining security information by detecting power characteristics, leading to the need for large charge storage capacitors and inefficient power supply methods that are not power-saving and are time-consuming.
Innovation Solution
A power supply device with a secure power supply, a stable voltage source, and a voltage selection device that dynamically adjusts the supply voltage based on the encryption/decryption device's operation, using both supply and stable voltages when the driving voltage is outside a set range to maintain it within the desired limits, reducing the size of the charge storage capacitor and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power pins and ground pins are isolated from external pads to prevent hackers from detecting power characteristics, then security is improved, but the encryption/decryption device cannot receive stable power during operation
Solution Approach 1:
A buffer circuit is introduced as an intermediary between the power pins and the encryption/decryption device. The buffer circuit includes a control unit that receives operation signals and adjusts the supply voltage accordingly, and a power supply unit that provides power through the buffer. This intermediary structure allows power to be supplied during encryption/decryption operations while preventing direct detection of power characteristics by hackers, thus resolving the contradiction between security and power supply stability.
2Power
If a large charge storage capacitor is used to maintain voltage during encryption/decryption operations, then power supply stability is improved, but the circuit area and operating time increase
Solution Approach 1:
The buffer circuit dynamically adjusts the supply voltage based on real-time operation signals from the encryption/decryption device. The control unit monitors the operational state and modulates the voltage output to match the instantaneous power requirements, eliminating the need for large charge storage capacitors. This dynamic approach maintains voltage stability while reducing circuit area and optimizing operating time.
3Loss of energy
If the supply voltage is continuously adjusted during encryption/decryption operations, then power efficiency is improved, but the complexity of the power supply device increases
Solution Approach 1:
The power supply device is segmented into distinct functional modules: a control unit that processes operation signals and determines voltage adjustment requirements, and a power supply unit that executes the voltage regulation. This segmentation allows for efficient power management through specialized functions in each module while keeping the overall design manageable and not excessively complex.
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
This solution reduces the size of the charge storage capacitor, operating time, current consumption, and circuit area while effectively protecting the secure system from hackers by minimizing power characteristic changes detectable via the power pin and ground pin.
Implementation Method 1
a charge storage capacitor CS, wherein one terminal of the switch SW1 is electrically connected to a system voltage of the power 10, and the other terminal of the switch SW1 is electrically connected to one terminal of the switch SW2, one terminal of the switch SW5 and one terminal of the charge storage capacitor CS
Data Source
AI summary
A power supply device for providing a driving voltage of an encryption/decryption device. When the encryption/decryption device is in operation and its driving voltage falls within the voltage range formed by an upper limit voltage and a lower limit voltage, only a supply voltage provided by a secure power supply device is used as the driving voltage for the encryption/decryption device. When the encryption and decryption device is in operation and its driving voltage falls outside the voltage range formed by the upper limit voltage and the lower limit voltage, the supply voltage and a stable voltage provided by the stable voltage source are used as the driving voltage at the same time, the supply voltage is further adjusted until the driving voltage falls within the voltage range formed by the upper limit voltage and the lower limit voltage, and then continue to use only the supply voltage as the driving voltage.