A substitutionmatrix lets you assign match scores individually to each pair of symbols.
使用置换矩阵能够根据每对符号单独分配匹配得分。
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For example, the BLOSUM (BLOcks SUbstitutionMatrix) matrices for proteins are commonly used in BLAST searches; the values in the BLOSUM matrices were empirically determined.
This paper introduces a completely nonsingular matrix based substitution permutation network that can effectively improve the performance of the block cipher against linear cryptanalysis.