Organic physically unclonable function on flexible substrate operable at 2 V for IoT/IoE security applications

We fabricated organic ring oscillators (ROs) on a flexible substrate and utilized them as the core circuit of a physically unclonable function (PUF). An RO-PUF is a security primitive that generates unique identification numbers (IDs) by extracting the frequency variation of the RO. We fabricated two RO-PUFs and evaluated their IDs in terms of stability and uniqueness at various operating voltages. The experimental results indicate that our RO-PUFs have a high degree of uniqueness and exhibit good stability relative to voltage fluctuations with a nominal operating voltage below 2 V.