Smart heat control of microchips — ScienceDaily

The new approach is based on identifying thermal patterns during normal operation of processors. “Every chip produces a specific thermal fingerprint,” explains Professor Jörg Henkel, who heads the team at the Chair for Embedded Systems (CES). “Calculations are carried out, something is stored in the main memory or retrieved from the hard disk. All these operations produce short-term heating and cooling in various areas of the processor.” Henkel’s team monitored this pattern with sensitive infrared cameras and reproduced changes in the control routine from minimum temperature changes or temporal deviations of a few milliseconds. The setup with infrared cameras was used to demonstrate feasibility of such thermal monitoring. In the future, sensors on the chip are planned to assume the function of the cameras. “We already have temperature sensors on chips. They are used for overheat protection,” Jörg Henkel says. “We will increase the number of sensors and use them for cyber security purposes for the first time.” In addition, the scientists want to equip the chips with neural networks to identify thermal deviations and to monitor the chip in real time.

The researchers think that their smart heat control will be applied in industrial facilities first. As mostly static control routines are executed, deviations are easier to identify than in a smartphone, for instance. However, also industry computers are exposed to dynamic threats. “As soon as the hackers will know that we monitor temperature, they will adapt,” computer scientist Hussam Amrouch, who works in the team of Jörg Henkel, explains. “They will write smaller or slower programs, whose heating profiles will be more difficult to identify.” Right from the start, the neural networks will therefore be trained to identify even modified threats.

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Materials provided by Karlsruhe Institute of Technology. Note: Content may be edited for style and length.