|Title||Circumventing a Ring Oscillator Approach to FPGA-Based Hardware Trojan Detection|
|Publication Type||Conference Papers|
|Authors||J. Rilling, D. Graziano, J. Hitchcock, T. Meyer, X. Wang, P. Jones and J. Zambreno|
|Conference Name||Proceedings of the International Conference on Computer Design (ICCD)|
Ring oscillators are commonly used as a locking mechanism that binds a hardware design to a speciﬁc area of silicon within an integrated circuit (IC). This locking mechanism can be used to detect malicious modiﬁcations to the hardware design, also known as a hardware Trojan, in situations where such modiﬁcations result in a change to the physical placement of the design on the IC. However, careful consideration is needed when designing ring oscillators for such a scenario to guarantee the integrity of the locking mechanism. This paper presents a case study in which ﬂaws discovered in a ring oscillator-based Trojan detection scheme allowed for the circumvention of the security mechanism and the implementation of a large and diverse set of hardware Trojans, limited only by hardware resources.