Recently, the Y-00 protocol has been developed as a defense against cryptanalysis. The Y-00 protocol has a high affinity with existing public communication networks and has also been shown to achive a large-capacity transmission. In this article, we aim to improve Key DSR, which is part of the functionality of Y-00. We propose a new model of Key DSR, and a discussion of the efficiency of the new model is presented. Finally, we show that the proposed method can contribute to the composition of a safety design approach for Y-00 encryption.