Improving hardware Trojan detection using scan chain based ring oscillators

Using the proposed method, the payload part of Trojans will be detected according to their size and cell types. Our method can be used by power-based Trojan detection approaches for finding the trigger part of Trojans. We also introduce an algorithm for quantifying the vulnerability of the nets. We show that a designer can achieve a good trade-off between area overhead reduction and security enhancement while evaluating the vulnerability degree of each net.