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Simple Tri-State Logic Trojans Able to Upset Properties of Ring Oscillators

Auteur(s) : L. Acunha Guimaraes, R. Possamai Bastos, T. Ferreira De Paiva Leite, L. Fesquet

Doc. Source: 11th International Conference on Design &Technology of Integrated Systems in Nanoscale Era (DTIS'16)

Publisher : IEEE

Pages : 1-6

Doi : 10.1109/DTIS.2016.7483811

Inserting hardware Trojans (HT) in ring oscillators (RO) of integrated systems is a malicious method that can considerably modify the behaviour of system circuits to produce undesired operations. This work presents and demonstrates three still unknown types of transistor-level Trojans based on the classic tri-state logic. If triggered, the presented HT are able to substantially change the jitter and frequency of RO. If disabled, thanks to their tri-state logic and tiny sizes, the circuit behaviour is not significant modified, making the Trojan detection through conventional functional testing or side-channel analysis unlikely. Results show the typical frequency of a 7-stage RO in CMOS 65-nm technology is kept within process corners if HT is off, and it is decreased by a factor of up to 0.7 when HT is on.