Before revision:  Second, we summarized and implemented four algorithms that can be used to construct UBM, and verified the " unhackable " security attributes based on the evaluation of the two key features. Furthermore, we completed the construction of UBM using the implementation of four verified algorithms and proved the practical applicability of UBM by calculating the volume increment and analyzing the actual counter defense capabilities .
After revision:  Second, we summarized and implemented four algorithms that can be used to construct UBM, and verified the " unhackable " security attributes based on the evaluation of the abovementioned two core features. After that, the four verified algorithms and proved the practical applicability of UBM by calculating the volume increment and analyzing the actual counter defense capabilities .