Abstract: Methods of half-duplex communication systems or full-duplex communication systems are provided. The half-duplex communication system includes n number user units-including a transmitting unit of transmitting units, wherein the transmitting unit including a channel estimation module, an identity update module and a modulation module; a receiving unit of receiving units including a demodulation module, a post-processing module and a reconciliation and verification module; a memory unit for storing prime identities, data to be transmitted and shared secret key; a control unit; an antenna connected to each of the transmitting units and each of the receiving units; and the methods are used for realizing a generation of shared secret keys, and an integrated identity verification and a data transmission using the half-duplex communication systems and the full-duplex communication systems.