Hardware Security
What characterizes electromagnetic side-channel analysis?
- AA small probe near the chip measures electromagnetic emissions from circuits and can sometimes capture location-specific detail
- BIt can never be measured from any distance with any equipment
- CElectromagnetic emissions have no relation to secret information
Show answer and explanation
Answer: A. A small probe near the chip measures electromagnetic emissions from circuits and can sometimes capture location-specific detail
Switching currents inside a circuit create electromagnetic fields around it. Bringing a small coil probe close to the chip surface can measure current changes in specific parts, such as a cryptographic block, in more detail than whole-chip power. Countermeasures, as with power analysis, include masking and circuits that smooth power variation, plus shielding with metal layers.
- A. Correct. It can yield more localized information than power measurement.
- B. Measurements from a distance have also been studied under some conditions.
- C. Changing currents create emissions that carry information.