  To increase the number of wireless devices, e.g., mobile or IoT terminals,
cryptosystems are essential for secure communications. In this regard, random
number generation is crucial because the appropriate function of cryptosystems
relies on it to work properly. This paper proposes a true random number
generator (TRNG) method capable of working in wireless communication systems.
By embedding a TRNG in such systems, no additional analog circuits are required
and working conditions can be limited as long as wireless communication systems
are functioning properly, making TRNG method cost-effective. We also present
some theoretical background and considerations. We next conduct experimental
verification, which strongly supports the viability of the proposed method.
