This paper investigates the achievable secrecy rate region of the Gaussian two-way
wiretap channel, which describes the simultaneous secure two-way transmission of a
confidential message. Through adjusting the time-sharing factor and the rate at which
the random secret key is fed back, the allocation and optimization for the secrecy
rates of two-way communication are achieved. Under peak and average power constraints,
the achievable secrecy rate regions of the two-way communication are derived respectively.