The model for a broadcast channel with confidential messages (BC-CM) plays an important\nrole in the physical layer security of modern communication systems. In recent years, it has been\nshown that a noiseless feedback channel from the legitimate receiver to the transmitter increases\nthe secrecy capacity region of the BC-CM. However, at present, the feedback coding scheme for\nthe BC-CM only focuses on producing secret keys via noiseless feedback, and other usages of the\nfeedback need to be further explored. In this paper, we propose a new feedback coding scheme\nfor the BC-CM. The noiseless feedback in this new scheme is not only used to produce secret keys\nfor the legitimate receiver and the transmitter but is also used to generate update information that\nallows both receivers (the legitimate receiver and the wiretapper) to improve their channel outputs.\nFrom a binary example, we show that this full utilization of noiseless feedback helps to increase the\nsecrecy level of the previous feedback scheme for the BC-CM.
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