Biasing a ring-oscillator based true random number generator with an electro-magnetic fault injuction using harmonic waves

This thesis shows the effect of an electromagnetic fault injection on true random number generators based on ring oscillators. It tests several designs, including ring oscillators of equal length and unequal length. We found that the created designs with ring oscillators of unequal length are more prone to fault injection. This research also shows that injecting the frequency of the operating frequency of the ring oscillators results in high mutual information. Fault injection using an electro-magnetic harmonic signal has a global effect, but also has local effects. An injection close to a wire connected to the ring oscillators seems like a good injection area.