Physically unclonable functions based on a controlled ring oscillator

The problem of constructing a new class physically unclonable functions (PUF) based on controlled ring oscillator (CRO) has beeb solved. relevance the creation CROPUF is associated with active development physical cryptography used for purposes identifying electronic products and generating cryptographic keys. It shown that classical oscillators (ROPUF) are characterized by large hardware redundancy due to need implement number ROs, since each bit response requires an independent pair real ROs. At same time ROPUFs better statistical properties compared PUFs arbiter type do not require ideal symmetry identity implemented As alternative ROPUF, proposed, namely, CROPUF, which uses controlling frequency generated pulses without changing functionality structure oscillator. An important advantage CRO possibility implementing its basis set reaches 2 m , where stages oscillator, them determined submitted request. three structures proposed PUF, namely CROPUF1, CROPUF2 CROPUF3 considered. Their main advantages disadvantages shown, including in case two implementation options, programmed logic (FPGA) arbitrary (ASIC). basic option FPGA, considered less prone inter-chip and, more importantly, intra-chip dependence caused technological features production process. Practical studies were carried out modern FPGAs, evaluating performance characteristics. operability when programmable logic, as well high rates their characteristics, been experimentally confirmed.