Design and Implementation a CRO-PUF by Increased Number of CRP to Securely Generate Cryptographic Keys in IoT Applications

With the expansion of the use of Internet of Things (IoTs) devices and the connection of all devices to the Internet, the need to provide security in this area has been felt, which the reason Physical Unclonable Functions (PUFs) were introduced. PUF is a lightweight and popular hardware security primitives for use in IoT devices. By scrutiny the benefit and weakness of PUF types, it was found that RO-PUF has a more suitable structure for implementation on FPGA because it has high reliability and it is easier to provide circuital symmetry. Therefore, it was selected for further studies. But on the other hand, RO-PUF have small CRP space and not attractive for authentication applications. By focusing on RO-PUF and reviewing the proposed structures introduced to improve RO-PUF and modify the CRO-PUF structure, a structure is created that exponentially increases CRP space and also reduces power consumption. The average reliability of the responses is 98.33% and the uniqueness of the response bits is 47.54%. Also, the average uniformity of response bits is 50.57%. The implementation results show that the proposed design is superior to other structures.