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Research Fellows Directory

Kasper Rasmussen

Dr Kasper Rasmussen

Research Fellow


University of Oxford

Research summary

Any embedded system that wishes to control or measure something, must

by necessity have a sensor or an actuator attached as a peripheral

element. Sensors come in many different varieties but most are "dumb"

devices that convert the quantity they are supposed to sense, into an

analog electrical signal that can be processed by a micro

controller. As an example consider a temperature sensor measuring


A temperature sensor consists of a material that changes resistance

depending on how hot or cold it is. The resistance can is measured as

an analog voltage level, and then converted into a temperature,

depending on the characteristics of the sensor material. Given this

construction there is no way for the temperature sensor to

authenticate the signal coming out of it. The signal is simply the

result of a physical process. This means that the micro controller has

no choice but to consider what ever comes from the sensor as


Our Initial experiments have shown that it is possible, to induce a

current in the wires connecting the temperature sensor to an embedded

system using an electromagnetic signal. We are now working on modeling

this process so we can determine exactly what signals to send in order

to get the desired effect in a particular sensor. This is complicated

by a number of factors e.g., distance, sensor wire length, type of

sensor, actual sensor readings, filters, passive components, the type

of ADC (analog to digital converter), etc.

Grants awarded

Adversarial Electromagnetic Interference

Scheme: University Research Fellowship

Dates: Oct 2015 - Sep 2020

Value: £464,771.80

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