Relay network assisted wireless terminal has an advantage for easily constructing wireless network but a disadvantage for information leak to the wireless terminal. For secure wireless communication, an encryption but the sharing of secrete key between information source and destination are required. A secure information sharing with artificial noise and mirroring null steering for avoiding the information leak to untrusted relay has been proposed. In this paper, for enhancing the security of this proposed secure information sharing, we consider two transmit controls, transmit power control (TPC) and the adaptive node selection of information source. We evaluate the secure capacity by computer simulation.
