Power Supply Device for Secure Encryption Systems
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Solution Overview
Problem
Existing power supply systems for secure systems are inefficient in preventing hackers from obtaining security information through power characteristics, requiring large charge storage capacitors, high current consumption, and complex circuitry, which are time-consuming and not power-saving.
Innovation Solution
A power supply device with a secure power supply, a stable voltage source, and a voltage selection device that dynamically adjusts the driving voltage during startup and operation, using a mode switch controller to select between supply voltage and stable voltage based on current demand, reducing the need for large capacitors and minimizing current consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a charge storage capacitor is used to isolate power pins and ground pins from external pads to prevent hackers from obtaining power characteristics, then security is improved, but the capacitor size and circuit complexity increase significantly
Solution Approach 1:
The patent extracts the power characteristics that hackers attempt to monitor by isolating the power pins and ground pins from external pads through the use of a charge storage capacitor. This capacitor acts as an intermediary that blocks the transmission of power consumption signals to the outside while still allowing power delivery to the encryption/decryption device, thereby preventing side-channel attacks without requiring complex shielding or filtering circuits.
Solution Approach 2:
The charge storage capacitor serves as an intermediary element between the power source and the encryption/decryption device. It temporarily stores electrical charge and releases it to power the device, while its isolated structure prevents hackers from measuring power characteristics through external pad detection. This mediator approach provides security without adding significant circuit complexity compared to alternative methods like active monitoring or complex power management circuits.
2Reliability
If a charge storage capacitor is used to prevent power characteristic detection, then security is improved, but the capacitor size increases requiring more charge capacity
Solution Approach 1:
The charge storage capacitor is pre-charged to a voltage level higher than the operating voltage of the encryption/decryption device before the device begins operation. This preliminary charging action ensures that the capacitor has sufficient stored energy to power the device through the entire encryption/decryption process without needing to be recharged, thereby providing both security and adequate charge capacity without requiring an excessively large capacitor.
Solution Approach 2:
The system operates in periodic cycles where the charge storage capacitor is charged during idle periods when the encryption/decryption device is not active, and then discharges to power the device during encryption/decryption operations. This periodic charging and discharging pattern allows the use of a smaller capacitor with sufficient total charge capacity, as the capacitor is recharged between operations rather than needing to contain all required charge simultaneously.
3Reliability
If multiple switches and a charge storage capacitor are used to isolate power pins, then security is improved, but the operating time and current consumption increase
Solution Approach 1:
The power supply function is segmented into multiple independent switches (SW1-SW5) that control different aspects of power delivery and isolation. Each switch can be independently controlled to optimize the balance between security and operating efficiency. For example, certain switches remain closed to maintain power supply continuity while others are opened to prevent external detection, thereby reducing unnecessary operating delays compared to a monolithic power control approach.
Solution Approach 2:
The switch control system dynamically adjusts the state of each switch based on the operational requirements of the encryption/decryption device. During active encryption/decryption, switches are configured to provide sufficient power while maintaining isolation. During idle periods, switches are adjusted to minimize current consumption while keeping the charge storage capacitor charged. This dynamic adaptation reduces both operating time and current consumption compared to static power control schemes.
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 effectively prevents hackers from obtaining security information, reduces the size and operating time of the charge storage capacitor, lowers current consumption, and minimizes circuit area, while maintaining stable voltage levels during encryption/decryption operations.
Implementation Method 1
a charge storage capacitor CS... the charge storage capacitor CS is charged by the system voltage of the power 10... the charge storage capacitor CS provides the supply voltage to the encryption/decryption device 14
Data Source
AI summary
A power supply device is used to provide power to an encryption and decryption device of a security system, including a safety power supply device, which is used to supply the supply voltage according to the system voltage; a regulated voltage source, which is used to provide a regulated voltage; and a voltage selection device, which is electrically connected with the safety power supply device, the stable voltage source and the encryption and decryption device. During the startup period of the security system, or, after the startup period of the security system and the encryption/decryption device performs encryption/decryption, only the supply voltage is selected as the driving voltage of the encryption/decryption device. After the startup period of the security system and the encryption and decryption device does not perform encryption and decryption, the voltage only the regulated voltage is selected as the driving voltage of the encryption and decryption device.