# Power line side channel attack Yes, it is indeed possible to eavesdrop on the computer's data processing process by analyzing the power line signal. This attack is called a "Power Line Side-Channel Attack" (Power Line Side-Channel Attack). ## Working principle 1. **Electromagnetic radiation correlation**: When a computer processes different data, the power consumption of its internal components (such as CPU and GPU) will vary slightly. 2. **Power consumption pattern**: These changes will be reflected in signal fluctuations on the power line 3. **Signal analysis**: Through the acquisition and analysis of these fluctuations by precision equipment, the operation being performed by the computer can be inferred. ## Known attack cases -Researchers have proven that encryption keys can be extracted by analyzing power line signals -Some attacks can even obtain information from power lines a few meters away without direct contact with the target system ## Defense measures -Use power line filter -Power isolation equipment -Implement a constant power consumption algorithm for key operations -Add random noise interference sampling to the physical layer Such attacks are mainly aimed at high-value targets, and ordinary users face lower risks, but they are a security threat that needs to be considered for institutions that handle sensitive information.