True random number generator based on ring oscillator PUF circuit

In this paper we propose the method of generating true random numbers utilizing the circuit primarily designed as Physically Unclonable Function (PUF) based on ring oscillators. The goal is to show that it is possible to design the universal crypto system, that can be used for various applications - the PUF can be utilized for asymmetric cryptography and generating asymmetric keys, True Random Number Generator (TRNG) for symmetric cryptography (generating session and ephemeral keys), nonces and salts. In the paper the results of evaluation of such a circuit utilized for TRNG purpose are presented.