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This paper investigates an unconditional communication model based on wiretap channel I. We will firstly review our previous study on build wiretap channel I in which the eavesdropper sees a binary symmetric channel (BSC) with error probability p while the main channel is error free. To make p as close to 0.5 as possible, the paper introduces a novel security code which helps turning the original system to achieve unconditional secure communications. Extensive simulation is conducted and the results verify our approach.