Physically Unclonable Function Using an Initial Waveform of Ring Oscillators.

A silicon physically unclonable function (PUF) is considered to be one of the key security system solutions for local devices in an era in which the Internet is pervasive. Among many proposals, a PUF using ring oscillators (RO-PUF) has the advantage of easy application to a field-programmable gate array (FPGA). In the conventional RO-PUF, the frequency difference between two ROs is used as one bit...