Investigation of signal conversion designs with TRNG based on ring oscillators

This paper presents circuits for processing signals generated by a ring oscillator and the results of testing the generated sequences for randomness. A total of 5 methods are presented for converting bit sequences obtained using the ring oscillator. The von Neumann approach and the XOR operation are used as conversion techniques. The NIST STS test suite is employed to validate the generated sequences. The sequence with the best results from the test is compared with the sequence encrypted using AES in counter mode.